Your cart
Diaphragm Pump
Diaphragm Pump

Diaphragm Pump

72 reviews
$ 49.99

This little diaphragm pump is an excellent choice for automatic top-off duty. Unlike other diaphragm pumps available, this little powerhouse can push water to 30psi. It can also safely run dry, unlike conventional powerheads. It is quiet and runs on 24v DC power. Flow rate is approximately 400mL/min, but note that it is not rated for continuous duty nor salt water applications. This means for intermittent use (as in ATO usage) it is great, but we do not recommend it for use as a calcium reactor feed pump, for example.  It can be used in conjunction with a kalk stirrer, but only to push fresh water into the stirrer.  We do not recommend pulling kalkwasser through the pump, as the high pH may shorten the life of the rubber diaphragms.

Diaphragm pump kit includes:

  • Pump in wall-mountable box
  • 24v DC Power Supply or 5' cable with Neptune compatible 24v plug 
  • Tubing, 10ft
  • Check valve to prevent back siphoning
  • Micro ball valve to adjust flow rate (max 400mL/min)
  • Siphon break tee (see instruction manual for details when this is needed)

Technical Specs:
Max flow rate:  400mL/min @ 0ft head pressure
Min flow rate: Fast drip
Max head pressure: 30psi 
Run dry: Yes
Self priming: Yes
Power: 24v DC, 4w 
Warranty: 1 year

Click here for instruction manual

Customer Reviews
4.9 Based on 72 Reviews
Write a Review Ask a Question
  • Reviews
  • Questions

Thank you for submitting a review!

Your input is very much appreciated. Share it with your friends so they can enjoy it too!

Filter Reviews:
Eric E.
United States United States
Amazing ato pump

I have used two of these pumps as a replacement pump for the weak neptune pmup that comes with the ATK kit. It is super powerful pulling water from my mixing station a floor below my tank. I consider it a must with my neptune atk kit.

pascal y.
United States United States
Really nice pump

This is a really impressive pump. I’m using this as an ATO pump. It is *pulling* through about 30’ of tubing over an 8’ height. Moves just the right amount of water for an ATO and is surprisingly quiet. Really happy with the pump!

Douglas W.
United States United States
Solid Pump

The diaphragm pump is great. Its compact and just works!

Bill G.
United States United States
The pump worked great for several days.

I connected the pump to my external overflow to maintain the syphon. It worked perfectly and solved the problem of inconsistent flow. I went out of town for 3 days and returned to find the pump not working. I'm working now with customer service. They responded quickly to my first inquiry; waiting to see what the final outcome will be.

Avast Marine Works

Sorry about your experience! This pump is not rated for continuous duty nor salt water applications, we do not have a pump that will work for your application unfortunately.

Benjamin K.
United States United States
Great replacement for PMUP as ATO pump

I replaced my PMUP v2 with an apex version of this diaphragm pump to work with the Apex ATK as my auto top off pump. Hopefully it will last longer than the PMUP did, especially with this pump’s ability to run dry. And if I ever need to relocate the ATO reservoir to another room, I’ll have that option. It is a little bit louder than the PMUP and doesn’t have a smooth sound so probably not a good option if you’re sensitive to sound. I was surprised at first but I’m ok with the sound, and I think it’s a fair trade off for the features and reliability.