Contaminants in the air compressor are the worst thing that may happen. These contaminants can be water vapor, rust, pipe scales, oil, or solid particulates. The only way to solve these issues is to use water separators. I looked into some of the best-rated water separators from various manufacturers. Each one of them has its own high and low points. The description below covers every detail. I examined the general construction quality, the drainage system, and types of filters. My top pick is NANPU 3/8″ NPT. But, there are a few more that can help you with your requirements.
So, begin reading product opinions to assist you in selecting the best water separator for air compressor. And, also go through the buying guide, which is at the end of the post.
Best Sturdy: NANPU 3/8″ NPT
The NANPU water separator is a high-performance and best water separator for air compressor. Its 5-micron brass filter element provides excellent filtering results. When there is no air supply, the semi-automatic drain clears the impurities smoothly.
Features of NANPU 3/8″ NPT Compressed Air Filter Regulator Lubricator Combo Water/Oil Trap Separator
- Flow rate: 1700 L /Minute
- Operating pressure range: 0-145 psi
- Filter element size: 5 Micron, Brass Filter Element
What I liked about NANPU 3/8″ NPT?
The filter, lubricator, and regulator are integral elements of a three-part system. The filter effectively removes liquid and solid contaminants from the air supply. You can adjust the outlet pressure using the self-relieving pressure regulator. The lubricator provides oil to the air tool, extending the tool’s life.
This best water separator for air compressor can sustain moderate pressure. Furthermore, it has a polycarbonate bowl with a metal guard. This ensures long-term durability. Personally, I liked the sturdiness that comes with metal housing. Plus, you can also connect it to your standup compressor. Also, you will need the reducer bushing. You can use the old air input fittings.
What I didn’t like about NANPU 3/8″ NPT?
Sometimes faulty O-ring can cause air leak at the knob.
Pros
- Semi-automatic drainage
- Aluminum build material makes it durable
- Small and compact
- Metal housing is quite sturdy
Cons
- Plastic fitting
- No manual to understand how to use
Who can use NANPU 3/8″ NPT Compressed Air Filter Regulator Lubricator Combo Water/Oil Trap Separator
You can install this for home use or small workshops. It’s good and maintains air pressure. The only problem while using it is around visually impared people. The dial is very small. So, they may struggle reading it in poor lighting.
Best Ease of Adjustment: Tailonz Pneumatic 1/4 Inch Air Water Separator
The Tailonz pneumatic water separator follows a simple pressure adjustment method. This air compressor has accurate pressure regulation. The device has a modular design. Such a design allows it to be arbitrarily disassembled and combined.
Features of TAILONZ PNEUMATIC 1/4 Inch NPT Air Filter Pressure Regulator Water/Oil Trap Separator Combo(0-145PSI)
- Flow rate: 1000 L /Minute
- Operating pressure range: 0-145 psi
- Filter element size: 40 Micron
What I liked about Tailonz Pneumatic 1/4 Inch Air Water Separator?
The Tailonz Pneumatic air compressor has intimate dust plugs. They stop dust and moisture contaminants from penetrating the body. The operator can regulate the pressure in the range of 0 to 145 psi. Pressure induction is more accurate with the pressure gauge encompassing a copper core. The metallic shell provides resistance to corrosion and impact.
This comes with a transparent measuring cup. The backrest brackets make it simple to mount the tool on the wall. This one is very easy to install. So, even an amateur can attach it without any hassle. It is pretty small. So, you can use it for an airbrush.
What I didn’t like about Tailonz Pneumatic 1/4 Inch Air Water Separator?
It’s oil flow control button leaks oil and can create mess around.
Pros
- Light structure
- Long service life
Cons
- The filter cup’s volume should not surpass 80 percent.
- Low flow rate
Who can use TAILONZ PNEUMATIC 1/4 Inch NPT Air Filter Pressure Regulator Water/Oil Trap Separator Combo(0-145PSI)
I would suggest using this compressor for home workshops. Woodworkers for model painting, oil painting, and other small-scale projects can also use it. This compressor is small. So, the flow rate is also low. Thus, it would be difficult to maintain high-pressure tasks.
Best Heavy Duty: NANPU DFR-04
The NANPU DFR-04 water separator is an automatic device made of aluminum. The metallic build provides long-term durability. The air compressor has a built-in bracket that strengthens and tightens the fit. The compressor filter dryer includes a double 5-microns filter element.
Features of NANPU DFR-04 1/2″ NPT Air Drying System – Double Air Filters, Air Pressure Regulator Combo
- Flow rate: 3000 L /Minute
- Operating pressure range: 0-145 psi
- Filter element size: 5 Micron, brass filter element
What I liked about NANPU DFR-04?
The NANPU DFR-04 1/2″ NPT Air Drying System works great with heavy-duty compressors. The metal guard gives greater strength to the Polycarbonate Bowl. It has a set of double air filters as well as an air pressure regulator.
This air compressor has a self-relieving pressure regulator. If there is no pressure, the drainage column will automatically get emptied. Remember to not connect the supply hose to the end of the regulator. It may lead to an air leak. Further, you may have to manually tighten the fittings. And this is also the case for drain valves. For this, you can simply change the spring. With this, there is no manual interaction to close the valves for low pressure.
What I didn’t like about NANPU DFR-04?
This water separator requires skill to make it fit properly and seal, otherwise you will constantly have leaking air.
Pros
- Built-in brackets for leaking proofing
- Small and compact in size
Cons
- Improper instruction manual
Who can use NANPU DFR-04 1/2″ NPT Air Drying System – Double Air Filters, Air Pressure Regulator Combo
This one has almost all the fittings that you would need. Even the plumber’s tape is included. So, professionals and amateurs for blasting wooden cabinets, automobile painting, and welding jobs can easily use it. That’s because although it is small, it is still very effective.
Best Value for Money: THB 1/2″ Water Separator
THB 1/2″ water separator is a low-priced alternative to extract moisture from the airlines on single-stage air compressors. The build materials are a high-grade blend of plastic and metal.
Features of 1/2″ Particulate filter water trap seperator moisture Compressed Air Compressor
- Flow rate: 3000 L /Minute
- Operating pressure range: 0-145 psi
- Filter element size: 5 Micron
What I liked about THB 1/2″ Water Separator?
I have included this in the best water separator for air compressor list as it is reasonably priced and provides outstanding value. At first, you will see all the particles getting trapped inside. Then it collects the water. Last, as soon as you release pressure in the air hose, the water gets drained. Internal filters are easily available and replaceable, reducing ongoing maintenance.
The high-grade filters keep any moisture vapor and debris from entering the air tools. It is a great water separator that combines performance with high-quality build materials.
What I didn’t like about THB 1/2″ Water Separator?
You might have to look after the plastic bowl occasionally as it leaks after heavy use.
Pros
- 5 oz polycarbonate bowl with metal shield.
- 5-microns filter removes 95% of contaminants
Cons
- No wall mounting bracket
Who can use 1/2″ Particulate filter water trap seperator moisture Compressed Air Compressor
This is best for someone who wants to use it daily because the filter is pretty sturdy. Also, it is as small as a coke can while working as it has to.
Best Easy-to-Use: Neiko 30252A – 1/4″ NPT
Neiko 30252A Water Separator handles pressure in the range of 90 to 120 PSI. This water separator traps and removes water droplets, dust, or oil. It has aluminum housing and brass fixtures. They are well-fitting and provide excellent performance.
Features of NEIKO 30252A Water and Oil Separator for Air Line | 1/4″ NPT Inlet and Outlet
- Operating pressure range: 0-90 psi
- Filter element size: 5 Micron
What I liked about Neiko 30252A – 1/4″ NPT?
The Neiko 30252A has a see-through design. That helps us to keep a check on the amount of water and particles trapped inside. Also, it has a manual drain system with an easy release valve. The water filter has a lightweight design.
What I didn’t like about Neiko 30252A – 1/4″ NPT?
You will need to tight it very well or else water will leak from the end
Pros
- Durable and easy control
- Compatible with different pressure ranges
- Transparent polycarbonate housing
Cons
- Difficult to dry out because of its horizontal position. You may have to add a few pieces of pipe or something to elevate it a little at an angle.
Who can use NEIKO 30252A Water and Oil Separator for Air Line | 1/4″ NPT Inlet and Outlet
You can put this on the line of your paint sprayer. If you think your tools will be affected by oil or water in the line, then get this one.
Best Handy: Hromee 1/4 Inch Air Compressor Water Separator
The maximum pressure capacity of the Hromee water separator is 150 PSI. This one is robust and can be considered the most powerful air compressors.
Features of Hromee 1/4 Inch Air Compressor Filter Regulator Combo, Water Oil Separator with Pressure Gauge
- Flow rate: 550 L /Minute
- Operating pressure range: 0-150 psi
- Filter element size: 5 Micron
What I liked about Hromee 1/4 Inch Air Compressor Water Separator?
The flip side of the Hromee water separator accommodates an adjustable pressure control knob. It is compatible with all types of air compressors. The pressure gauge provides accurate readings for precise control.
It has a ball valve made of forged brass to endure high temperatures and pressure. Also, it has a transparent filter cup and a manual drain system. The best thing I liked about this compressor is that it has a very sturdy regulator. And, you can mount it on the wall. There is a shut-off valve and a few extra connection components to help you with easy setup.
What I didn’t like about Hromee 1/4 Inch Air Compressor Water Separator?
The filter is not durable. It is made up of plastic. Secondly, the instruction manual has some model numbers of the compressor. But it seems they do not match the actual product.
Pros
- Durable with metallic build
- Long-lasting ball valve and brackets
Cons
- Filter element made of plastic isn’t very long-lasting.
- Incorrect manual.
Who can use Hromee 1/4 Inch Air Compressor Filter Regulator Combo, Water Oil Separator with Pressure Gauge
If you want something to be wall mounted with extra connection components, this one’s for you. Hobbyists, homeowners, DIYers can use this for spray painting and other low-key projects.
Most Compatible: Le Lematec Air Compressor Filter, Inline Water Separator
Le Lematec air compressor water separator with drain valve is the most compatible model. The inline air filter operates between 90 and 150 PSI, making it ideal for use as a plasma filter.
Features of Le Lematec Air Compressor Filter, Inline Water and Moisture Separator with Drain Valve
- Operating pressure range: 90-150 psi
- Filter element size: 5 Micron
What I liked about Le Lematec Air Compressor Filter, Inline Water Separator?
The AI-303 Water Oil Dirt Filter from Le Lematec is an inline filter. It has a push-button drain valve for quick and easy cleaning.
Moreover, it’s made of aluminum and has solid brass fittings, so it’s extremely durable. The kit of this best water separator for air compressor includes a 1/4 inch connector to securely obtain the correct airflow.
What I didn’t like about Le Lematec Air Compressor Filter, Inline Water Separator?
I feel it restricts the airflow which results in less power to the tool. So, professionals need to think about it. Also, it has a manual drainage system.
Pros:
- You can use it for industrial applications too.
- Works at almost any angle
- Adequate condensation management to avoid rust
Cons
- Manual drainage system
Who can use Le Lematec Air Compressor Filter, Inline Water and Moisture Separator with Drain Valve
If you are into the painting job and see some water at the end of the pipe, then pick this one. It even helps in quality woodworking. I would suggest you put it vertically. It will surely drain even the last drop of water perfectly.
Best Versatile: TCP Global Mini In-Line Air Filter
The TCP Global Mini in-Line Air Filters incorporate two premium mini inline air filters. It offers zero clogging from moisture.
Features of TCP Global Mini in-Line Air Filter, Oil and Water Separator (Pack of 2)
- Operating pressure range: 0-90 psi
- Filter element size: 5 Micron
What I liked about TCP Global Mini In-Line Air Filter?
The reservoir of this air compressor is transparent. It also has a drain release valve with a push button that allows you to clean all of the dirt with just one press.
The TCP Global Mini Inline water separator has 1/4′′ air input and output. These ideally fit in pneumatic tools like air hoses, paint sprays, and other similar items.
What I didn’t like about TCP Global Mini In-Line Air Filter?
It may leak after some time when used regularly
Pros
- Durable build
- Easy and effective draining of the dirt
- Perfect fit inlet and outlet port
Cons
- Not effective in different work angles
Who can use TCP Global Mini in-Line Air Filter, Oil and Water Separator (Pack of 2)
For the price, I wouldn’t say it is a bad one. It has zero moisture clogging. So, you can pick this one up for spray guns, compressor air lines, and air tools.
Most Easy to Install: Hotusi 1/4″ BSP Air Compressor Water Separator
Hotusi BSP water separator is a compatible option. It functionally works with air compressors and other air tools with a 30-120 PSI pressure range. With the included air filter regulator, you may adjust the pressure.
Features of Hotusi 1/4″ BSP Air Compressor Moisture Filter Trap Oil Water Separator Regulator Lubricator
- Flow rate: 750 L /Minute
- Operating pressure range: 30-120 psi
- Filter element size: 40 Micron
What I liked about Hotusi 1/4″ BSP Air Compressor Water Separator?
The Hotsui water separator displays its resistance to high pressure. The airflow rate of 26 CFM Flow makes it highly effective. It will most likely fit in most tools due to its 1/4′′ BSP design.
Small particles, as small as 40 microns, can be removed to extend the life of air tools. It is compact and easy to install. It will take hardly 5 minutes to install. You can fit this vertically by replacing the moisture tap.
What I didn’t like about Hotusi 1/4″ BSP Air Compressor Water Separator?
Be careful while adjusting the air gauge, if you turn it more than it’s limits then it may start leaking air.
Pros
- Requires less maintenance
- Sustains high pressure
Cons
- Manual dust extraction
Who can use Hotusi 1/4″ BSP Air Compressor Moisture Filter Trap Oil Water Separator Regulator Lubricator
If you need an air compressor that can work the best at 110 psi, you can rely on this one. So, I would suggest it to use for small setups for working with spray guns and air tools. Also, it gets installed in less than 5 minutes. Thus, you would not need a professional experience to know about it.
Best Lightweight: Ingersoll Rand ARO F35231-400-VS
Ingersoll Rand Filter is the ideal equipment for people who want corrosion-free air lines of air compressors. It has 3-micron filtration. This efficiently filters solid and liquid pollutants from the air.
Features of ARO F35231-400-VS Air Line Filter, 3/8″ NPT – 150 psi Max Inlet
- Flow rate: 3030 L /Minute
- Operating pressure range: 0-150 psi
- Filter element size: 5 Micron
What I liked about Ingersoll Rand ARO F35231-400-VS?
The Ingersoll Rand water separator unit features an ARO-Flo filter, lubricator, and regulator. They all ensure that less air gets suffocated throughout the air preparation process.
There’s a manual drainage system for easy removal of the contaminated water. It has a filter made of 1.3-ounce polycarbonate and has a bowl guard. You can either remove the entire drain cup or drain with the spring-loaded stopper. You shall find it at the bottom. The only problem you may face is that the outlet is on the right and the inlet is on the left. So, you may have to fit it on the wall for easy usage. Otherwise, it is difficult to face the front of the filter towards the compressor.
What I didn’t like about Ingersoll Rand ARO F35231-400-VS?
It feels like the company has used low grade plastic to manufacture the filter.
Pros
- Effective airflow rates
- Minimal leakage rates
- 2 year limited warranty
Cons
- Installation is not that easy.
Who can use ARO F35231-400-VS Air Line Filter, 3/8″ NPT – 150 psi Max Inlet
As a hobbyist running air tools, you will like the small amount of air getting on the walls of the compressor. So, you can use it for small paint booth automobile parts, home garages, light-duty projects. Also, you may not be able to find all the parts of this compressor in the market. So, getting the whole tool replaced would be better. At last, you are installing a bigger tool that comes at a minimal cost.
My Verdict
I’ve done sufficient research to identify the best water separator for air compressor. The first one, though, is my personal choice. The NANPU 3/8″ NPT offers flexibility because you can add an extra outlet if needed. When necessary, this best water separator for air compressor has a semi-automatic drain to remove excess water.
Buying Guide
Let us look at some important factors which can help you choose the best water separator for air compressor.
Bowl Quality
After filtering out of the airline, the pollutants will accumulate in the bowl. While going for your best water separator for the air compressor, check if the bowl is made up of high-quality materials. Good quality bowls do not crack easily. Bowls are also difficult to replace. So, make sure they’ll be able to withstand the strain.
Bowls can be of various types.
- A metal bowl is generally of rigid quality, but it is not transparent.
- Whereas a polycarbonate bowl is both robust and transparent.
Filters Classification:
Filters come in a variety of shapes and sizes. In some cases, you might require one, but most ordinary models will come with a basic water separator filter.
Consider the following to recognize your best water separator for an air compressor.
Water separator filter:
When all you’re concerned about is water entering your air system and no other impurities, such basic filters will suffice. However, the majority of them can also remove dust and oil.
Particulate filter:
Small solid particles can be removed from the system using these airline filters. This removal happens typically after the particles have gone through desiccant air dryers. They are generally capable of capturing very minute pollutants, such as corrosion particles.
Activated carbon filter:
Activated carbon is used in various filters. It is because of its outstanding ability to eliminate a wide range of pollutants. All thanks to its large surface area. They are excellent in removing oil vapor and odors from compressed air.
Coalescing Air Filter:
These filters clear the aerosols. They catch smaller water droplets, which grow into larger droplets. Subsequently they are evacuated and blocked from returning into the air. They are effective at removing oil and excess water, but they have to be replaced daily. Coalescing filters are available in cold variants, which improve their efficiency.
Compressor Intake Filter:
This filter is excellent at blocking airborne pollutants. You should note that several of them will catch everything bigger than 0.5 microns in size. However, some can be much more effective.
High Particulate Filter:
These filters are highly effective in removing airborne particles, as their name implies. These are incredible qualities, with some ability to trap particles as small as 0.01 microns. They are capable of doing so without experiencing any pressure drop. I would recommend having this one.
Air Inlet:
The air inlet size to purchase the best water separator for your air compressor is essential. The port size is available in several sizes, including 3/4 “, ⅜,” and so forth.
Filter Element:
To ensure maximum durability, the filter element of the water separator must be of excellent quality. Before finalizing the purchase, ensure this feature is available in the model you would like to buy.
Dial:
It’s essential when you are dealing with your water-oil separator with maximum pressure. It will display the current pressure level in the unit. If there’s been a pressure loss or if your best water separator for air compressor is nearing its maximum operating limits, the dial will help.
Flow rate:
You’ll need a flow rate that can handle the compression system you’ve installed. Cubic feet per minute are frequently connected with the PSI figure. However, they are two different entities, so make sure they are compatible.
Load Capacity:
The filter’s loading demand is met by its pressure regulator. Even your best water separator for the air compressor will be worthless if it can’t handle its capacity.
Ambient Temperature:
This will examine the capability of the water separator to cope with extremely high or low temperatures. It’s good to check if you’re working in a hot or cold setting.
Type of Drainage System:
A water separator compressor would not be complete without a drain. It certainly keeps your pneumatic tools up and for an extended time by removing much water. These come in three types –
Semi-Automatic Drain:
For many people, these are incredibly effective and remove the hassle of draining your system. When there is zero pressure, they will generally drain. However, the outlet port will stop functioning once there is high pressure.
Manual Drain:
You must continuously monitor the moisture content level of such drains and drain it as necessary. When the water level rises, you’ll have to beat the air system yourself. You must recall dumping your tank on a consistent schedule with this sort of drain.
Automatic Drain:
Once the water reaches a predetermined point, this sort of drain will auto drain it. This usually happens once the bowl is around half-full. A float will be deployed, and the liquid will drain out of the unit as soon as the limit is met.
Conclusion
The evaluation listed above will help you in making an informed decision to find the best water separator for air compressor. The best among the list, in my opinion, is NANPU 3/8″ NPT. But check the rest, their features, and select the one that best suits your needs.
