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Diaphragm Pump
Diaphragm Pump

Diaphragm Pump

59 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 59 Reviews
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Michael C.
United States United States
Diaphragm pump

Very powerful pump pulls my ato water from 30 ft away. It does make a little humming nose but barely noticeable.

Jeremiah L.
United States United States
AVAST Pump is head and shoulders above the PMUP

I have a 55gal RODI / ATO resivoir in my garage. I had installed the Neptune ATK with the PMUP to handle my auto top off... It worked perfectly except when my barrel would get down to the last 15gal or so it would lose its prime and then just run the pump until the timer stopped it without actually topping off. I resolved this by having the barrel fill before it got down that low... But that defeated the purpose of such a large tank! This pump solves that. I installed it and tested with the barrel only an inch from empty probably only 1-2 gallons left and this pump pulled a prime and pumped to my sump with no issue. I'm going to be buying a couple more to serve other duties. Thank you!

Rolando A.
United States United States
Diaphragm Pump

The pump definitely over exceeded my expectations! The pump is a little noisy, but not bearable!

Daniel S.
United States United States
Quiet and Strong

This is my second of these units, the first still runs quiet and moves water after several years of use. Both have worked ad advertised and I wouldn’t hesitate to recommend them to anybody needing the capability these provide.

Manfred L.
Canada Canada
Powerful small pump

I am using this pump to pump the R/O water from basement to ground floor, so noise is not a issue