Reverse Osmosis Faucet
Air Gap or Non Air Gap?

Reverse Osmosis FaucetReverse Osmosis Faucet

A reverse osmosis faucet is one of the most important parts of a reverse osmosis water filter system.

Reverse osmosis faucets are offered in two types: air gap and non air gap faucets.

Regardless of your reverse osmosis water system, you can always replace or change your reverse osmosis water faucet when the need arises.

Signs that your faucet should be replaced include rust, leaking or low water supply.

It is very important to note that not all R.O. faucets are the same. They will vary in size, style, color, shape, and quality.

That is why choosing the best faucet for your reverse osmosis system is very important.

Choosing The Best Reverse Osmosis Faucet?

There are a few factors to consider when choosing the best reverse osmosis water filter faucet that will meet your needs.


Most faucets for R.O. Water filter systems are made of stainless steel. A few on the market are actually bronze reverse osmosis faucets and they cost a bit more than the stainless faucets.

Everyone wants and needs a faucet that is durable and effective for years.


You will find faucets, especially online, for as little as $5 and some as expensive as $100.

Don't always go for the cheapest faucet; instead, go for a combination of price and quality.


Some faucets are easier to install than others. They don't even require you to use any tools.

Then there are a few on the market that are so complicated that you will need a professional to install it.

Types of Faucets

The two main types of R.O. faucets are air gap faucets and non air gap faucets.

Even though the air gap faucet is noisy and can sometimes be messy, it is perfect for situations where the waste water may back wash into the reverse osmosis filter.

2 Main Types Of R.O. Faucets

There are two types of reverse osmosis faucets.

Air Gap Faucets

Air gap faucets are generally used with under counter reverse osmosis systems.

You really only need an air gap faucet if you have a reverse osmosis filter. An air gap faucet is not needed for a regular water filter because there is no need for a drainage connection.

The main purpose for an air gap faucet is to ensure that in case of a drain backup, the drain water won't enter the line with filtered water.

Air gap faucets typically have 2 or 3 lines, each tube varying in size.

The main tube, which is usually vertical, will supply you with pure filtered water once pressure is applied to the lever.

The second and third tubes are a part of the drainage system.

So now you may be wondering how an air gap faucet works?

Reverse osmosis water filters generally use 3 to 5 gallons of water to produce 1 gallon of filtered water. The other 2 to 4 gallons is considered waste water.

With an air gap faucet, the waste water flows upwards through the main line. The second line takes drain water in and the third line takes the drain water out.

All air gap faucets have a small hole either on the top or the base of the faucet. This hole is important because it will suck air in case there is reverse suction.

This air gap is important because without the air gap hole, contaminated waste water will re-enter your filtered water.

One major drawback to air gap faucets is that they are often noisy and messy.

Non Air-Gap Faucet

Whereas the air gap faucet will have 3 water lines, the non air gap faucet will have only one main connection.

With this one tube, only filtered water will enter the tube.

If you are concerned about drain back up, you can always purchase and install a check valve.

The check valve will divert the waste water away from the filtered water.

Step By Step Guide : How to Replace A Reverse Osmosis Faucet Filter

Whenever you feel like your faucet is not performing like it should, it may be time to change your faucet.

While replacing your faucet most times require a professional, it can be interesting to try it on your own.

Follow these simple steps to replace your reverse osmosis faucet.

  1. Turn off the water supply to your reverse osmosis under sink water filter. This will stop water from going to the reverse osmosis system.
  2. Turn off the check valve on the storage tank. This will prevent any water from coming through the faucet.
  3. Release the air from the faucet by pressing and holding down the lever of the faucet for about 45 seconds.
  4. Use an adjustable tool, a wrench or a "deep socket tool” that will unscrew the connection under your sink to the faucet. Once the faucet is loose, remove the faucet from your counter.
  5. Remove the main tube by holding down the tube and pushing out the tube
  6. Remove the adapter, the nut and the two washers from the faucet
  7. Now remove your new faucet from the package. Then attach the smaller rubber washer, then the metal flange then the rubber washer. Everything should be done in this order.
  8. Gently fit the faucet in the hole of your faucet and ensure that it is centered.
  9. Go under the counter and attach the washer and the adapter to the base of the faucet.
  10. You will now need to install the tube into the faucet. Before installing the tube, ensure that the insert is inside the tube when the tube is installed inside the adapter. If this step is not done, your reverse osmosis faucet will cause problems.
  11. The end of the tube will be inserted into the adapter. Now turn back on your water supply and the check valve.

Also Read:

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