4 Best Sump Pump Check Valves of 2021 Compared & Reviewed

Best Sump Pump Check Valve
Photo: youtube.com

A sump pump check valve only allows water to flow in one direction, and this is what makes a sump pump work by pushing out water from deep in the pool without it flowing back.

As such, it is a very critical component to running your pool’s circulation system, especially when draining out the water for cleaning or general maintenance. Failure to get a high-quality sump pump check valve might compromise the performance of your pump.

With that in mind, this article looks at 5 of the best sump pump check valves that you can get on the market.

What to Check Before Buying Best Sump Pump Check Valve?

How to Buy the Best Sump Pump Check Valve
Photo: Zoeller

From the review above, you can clearly notice some differences between the products. Therefore, before buying one, you should consider the following factors.

1. Compatibility

Compatibility mostly has to do with the fittings. Some sump pump check valves have threaded fittings while others have slip × slip connections.

For most PVC piping systems, slip × slip check valves like Zoeller’s 30-0181 are the best to buy because these connections work best with plastic pipes and PVC glue.

However, if you have metallic piping, such as galvanized iron, steel, or copper pipes, you will realize that most of them have threaded ends and thus, require threaded check valves.

That said, there are also PVC pipes with threaded ends, and thus, always ensure that you check your piping system’s connections first so that you buy a compatible check valve.

2. Size

The size of a sump pump check valve should be chosen based on the size of your pipes. Measured in inches, most of them come in 1-1/2 or 1-1/4-inch sizes and this basically means the size of the socket that connects to your pipes.

Therefore, if you have a 1-1/2-inch piping system, buy a matching size valve. For a 1-1/4-inch system, buy a 1-1/4-inch valve.

However, if you don’t know how to determine what size of pipes you have installed, there are universal fit valves such as Campbell’s 0823-15C that can connect to either side of pipes, and these should be considered instead.

3. Material

Strength is the main thing that should be checked in regard to the material. The most commonly used one is PVC because it is strong enough to hold the pressure from the pump and the water head. Other plastic structures can also work, but ensure they are sturdy.

Another benefit of using PVC plastic is that some units have a clear colored construction, which makes it very easy to monitor the internal mechanisms at a glance so as to detect any faults.

4. Noise

The next most important factor to consider is noise. This is usually caused by the water attempting to flow back down after the pump shuts off.

Some models depend on this backflow pressure so as to close the valve and in the process, can create a lot of noise as the flapper bangs shut the return opening.

This is called the hammering effect, and it can also be caused when the pump starts, pushing the water to force the flapper open very fast until it hits the other end with a bang.

To avoid all this, newer check valves like Campbell’s 0823-15C and AY McDonald’s 4424-100 2069C incorporate the use of spring-loaded flappers, which are far less noisy and therefore, the best ones to consider.

4 Best Sump Pump Check Valves of 2021 Reviewed




Campbell 0823-15C

1. Campbell 0823-15C (Best Campbell)

  • Universal fitting 1.5-inch union size
  • Slip x slip connection
  • Heavy-duty clear PVC construction
  • Spring-loaded gate
Zoeller 30-0181

2. Zoeller 30-0181 (Best Zoeller)

  • Bended flapper. Eliminate sharp 90° edges
  • 1.5-inch slip x slip unions
  • Unions handle up to 10 feet of head at 4.3 PSI
  • Ultrasonically welded PVC construction
Superior Pump 99555

3. Superior Pump 99555 (Best Budget)

  • Affordable
  • 1.25-inch inner and 1.5-inch outer threads
  • High-quality Nitril-Bruna N seal
  • ABS construction
AY McDonald 4424-100 2069C

4. AY McDonald 4424-100 2069C (Quiet Design)

  • Quiet design. Eliminates water hammering
  • Plastic construction with stainless steel clamps
  • Pressure tested valves
  • 1.5-inch female sockets

1. Campbell 0823-15C – Best Campbell Check Valve

Campbell 0823-15C Sump Pump Check Valve
Photo: Campbell

  • Size: 1-1/2 inches
  • Material: PVC
  • Dimensions: 3.3 x 3.3 x 9.5 inches

Campbell’s 0823-15C is a 1.5-inch sump pump check valve, which means that it has a 1-1/2-inch union that can be attached to any similarly sized NPT pipe in a slip × slip connection.

This gives it a pretty wide range of uses because this pipe size is widely used on most sump pumps, while the slip connections minimize the chances of leaks occurring.

Construction-wise, the unit is made of heavy-duty, clear PVC material, which makes it easier to monitor the operations of the valve from the outside, and thus, detecting any error, especially on the gate, is very easy.

This strong material also gives the product the benefit of being to handle up to 150 PSI of maximum water pressure at 72°F, with the cracking pressure being much higher, at 300 PSI at a temperature of 120°F.

The result of this is a very durable product, especially if you keep it within the operating range given in the instructions.

For the internal mechanisms, a spring-loaded gate ensures that water flows in only one direction and also enables you to install the valve in any orientation.

However, this also puts some pressure on the pump because it must push the water with enough pressure to overcome the spring’s holding force.


  • Universal fitting 1.5-inch union with a slip × slip connection
  • Clear PVC construction for easy monitoring
  • Heavy-duty PVC structure makes it very strong and durable
  • Spring loaded gate ensures water flows in one direction
  • Can be installed in any orientation


  • Spring loaded gate adds some pressure to the pump

2. Zoeller 30-0181 – Best Zoeller Check Valve

Zoeller 30-0181 Sump Pump Check Valve
Photo: Zoeller

  • Size: 1-1/4 or 1-1/2 inches
  • Material: PVC
  • Dimensions: 9.8 x 6.8 x 17.5 inches

Zoeller’s 30-0181 is a cleverly designed sump pump check valve, with a flapper on the inside that bends over a radius. This helps to eliminate sharp 90° edges, which might cause water hammering.

This prolongs the lifespan of the valve and makes it one of the best Zoeller sump pump check valves. 

For installation, this unit gives you the flexibility of either set it up vertically or horizontally, and features slip × slip unions that can handle up to 10 feet of head at a pressure of 4.3 PSI and at a temperature of 130°F.

The good thing about its slip × slip unions designs is that they can fit 1-1/2 or 1-1/4-inch pipes and have stainless steel clamps, screws, and nuts to further tighten the joints after gluing in the pipes.

Construction-wise, the valve’s body is made of an ultrasonically welded PVC material, with an opaque color that prevents visibility to the inside, but is strong enough to handle water at 25 PSI at a maximum head of 57 feet and at a maximum temperature of 130°F.


  • Bended flapper over a radius, eliminating sharp 90° edges
  • Can be installed in a vertical or horizontal orientation
  • Designed to reduce water hammering
  • 1-1/2 or 1-1/4-inch slip × slip unions, with stainless steel clamps
  • Strong ultrasonically welded PVC construction


  • Very big in terms of size (9.8 x 6.8 x 17.5 inches)
  • Opaque PVC body makes it impossible to monitor the inside mechanisms at a glance

3. Superior Pump 99555 – Best Budget

Superior Pump 99555 Universal Sump Pump Check Valve
Photo: Superior Pump

  • Size: 1-1/4 or 1-1/2 inches
  • Material: ABS
  • Dimensions: 2.8 x 2.8 x 7 inches

If you want a check valve for your sump pump and you are on a tight budget, then Superior Pump’s 99555 is the best option to consider.

Despite its low price, this product is actually fully featured, containing sockets with 1-1/4-inch inner threads for connecting to a similar-sized male threaded pipe, and 1-1/2-inch outer threads for connecting to a similar-sized female threaded pipe.

In addition to this, the unit comes with 2 adapters, which allow you to reverse these joint connections so that you have 1-1/4-inch outer threads for attaching a female threaded pipe and 1-1/2 inner threads for attaching a male threaded pipe.

This essentially means that you can hook up any 1-1/4 or 1-1/2 pipe to the valve, so long as it has threaded ends.

Structurally, the valve is made of a durable ABS plastic material and it has a high-quality Nitril-Bruna N seal on the inside, which keeps the flapper tightly shut so as to prevent any water backflow.

On the downside, the unit’s flapper is not spring-loaded and thus, it is entirely dependent on the backflow pressure to lock the return, and this might cause hammering.


  • Affordable
  • 1-1/4 or 1-1/2-inch threaded socket connections
  • Comes with 2 adapters for more universal fitting
  • Made of strong ABS plastic
  • High-quality Nitril-Bruna N seal on the inside for preventing backflow


  • Flapper might cause hammering

4. AY McDonald 4424-100 2069C – Quiet Sump Pump Check Valve

AY McDonald 4424-100 2069C Sump Pump Check Valve
Photo: AY McDonald

  • Size: 1-1/2 inches
  • Material: Plastic
  • Dimensions: 3 x 3 x 11.4 inches

AY McDonald’s 4424-100 has a very quiet design because it is made to eliminate water hammering, which is usually caused as the water tries to flow back once the pumping cycle is complete.

Other than that, the valve closing mechanisms on the inside are pressure tested to ensure no leaks, which assures you of good and reliable performance.

This product’s body is made entirely out of plastic and has a one-piece housing that ensures there are no gaskets, which might fail or start leaking over time.

For connections, this unit features 1.5-inch female sockets that are easy to install over similar-sized PVC, steel, or copper pipes, and each socket has stainless steel clamps that help in creating a tighter joint.

The only problem is that this valve is very expensive.


  • Quiet design that is made to eliminate water hammering
  • Pressure tested valve closing seals
  • Strong plastic, one-piece construction
  • Stainless steel clamps for tight fitting over 1.5-inch pipe connections


  • Expensive

How to Install the Sump Pump Check Valve?

How to Install the Sump Pump Check Valve
Photo: AY McDonald

1. Ensure that you have a compatible and fitting valve

The first step towards installing your sump pump check valve is to ensure that you buy a compatible one, with the right couplings (slip or threaded), and in the right size (1-1/4 or 1-1/2).

To make this easier, it is recommended to take a sample of the pipe with you to the hardware store so that you can try out the different types of check valves. This will ensure that you buy the correct one.   

2. Have all the required tools

After you have acquired the check valve, ensure that you have all the tools before beginning the installation. You should at least have a tape measure, a pipe cutter, a pipe cleaner, a utility knife, PVC cement/glue, and a glue applicator.

3. Turn off the sump pump

The sump pump must be turned off before doing the installation so that you do not wet yourself or your tools.

4. Locate and cut the discharge pipe

After turning off the pump, locate the discharge pipe and identify which is the best place to install the valve. Usually, this should be installed closer to the pump so that there is not much water trapped between the two once the pump is turned off.

Once you identify the best position, measure the length of the check valve and cut a similar long-distance on the pipe so that the valve can fit perfectly.

5. Fit the valve on the cut section

File, then clean the edges of the cut pipe using a pipe cleaner. After this, insert the valve into the discharge pipe and ensure that it fits.

If it fits on both ends perfectly, remove the valve, apply glue or PVC cement using the applicator to both the discharge pipe and the valve, then fit it back in and let the glue set.

6. Test the valve

After the cement has dried, test the valve by running the pump. Check whether there are any leaks, then turn off the pump and check whether water is stopped from flowing back.

How to Determine if the Sump Pump Check Valve is Leaking?

To check whether the sump pump check valve is leaking, follow the steps below:

1. Locate the check valve

If you do not know what a sump pump check valve looks like, look for hard plastic or metal body on the discharge lines that are slightly larger than the pipes.

2. If the pump is off, turn it on

The best way to check for faults is when the pump is running. Therefore, if it is off, pour some water (about 5 gallons) into the sump basin slowly. The pump should start automatically after the water level reaches a certain point.

3. Inspect the connections

Check whether the two connections between the check valve and the discharge pipes have any leaks. For more accurate analysis, wipe dry these parts then feel for water around them using your fingers. Take note of any leaking spot that you find.

4. Check for internal leaks

Once the pump turns off, check the intake pipe in the sump pit to see if there’s any water coming back from the discharge lines. If there is, then the seal inside the valve has failed.  


A sump pump check valve is an integral component for the efficient running of a sump pump in your swimming pool setup.

With the wide variety of them that are available on the market, we highly recommend Campbell’s 0823-15C as the best sump pump check valve that you should consider buying.