1850GPH 55W16FT Aquarium 24V DC Water Pump with Controller, Submersible and Inline Return Pump for Fish Tank,Aquariums,Fountains,Sump,Hydroponic,Pond,Freshwater and Marine Water Use

Looks good for now.

Not real expensive and does the job in our reef tank. Only problem was the old one only lasted 7 months. Hoping this one lasts.

There are many positive reviews from others, perhaps I got a bad unit. The seals between the hose fittings and the pump inlet/outlets just seem terribly designed, both from the perspective of the actual O-Rings and the sealing surfaces of the pump and fittings. There is barely any material on the inlet side for the O-ring to seal against. I found that consistently when tightening down the nut on the inlet fitting, it would basically squeeze the O-ring out of place rendering it completely useless. The outlet O-ring performed better but was still not ideal. After I was finally able to get the inlet to stop leaking with a lot of time, and silicone RTV, the main pump body seal was leaking! Taking apart the pump body I found that the O-ring for that seal seamed damaged and the sealing surface was scratched up as if the technician who built the pump was using a flathead screw driver to install the O-ring and gauged the sealing surfaces. I tried my best to seal the pump body and used more silicone. Eventually it seamed sealed enough but now the issue is the pump was sucking AIR while running now and was extremely loud because of all the bubbles it was pushing through the housing.

After about a year of use, the controller kept flickering on and off. Eventually, the controller died. The pump itself is good but the wiring for the controller is garbage...

For the 1850gph pump. The inlet threads fit 1 1/4 inch PVC. The threads on the top outlet are 1inch and for 1inch PVC adapters. Update: 2025/10/04 I have now purchased two of these pumps. They work very well and are extremely quiet. At level one, 30% of operation, it will pump between 500 and 600gph. You cannot go wrong getting this pump if what you need is something that pumps between 550gph and 1850gph. I use one externally to circulate my saltwater holding tank and I use one in my 125g reef tank sump.