SEAFLO 42 Series 12V 3.0 GPM 55PSI Continuous Duty Diaphragm Pump with Bypass for Reduced Cycling, Fresh/Salt Water, 4-Year Warranty, UL & CSA Certified, Self-Priming for Marine, RV, Off-Grid, Boats

I've edited my original review, which I will leave below for reference. On my second trip back to the boat after installing the pump the problem with problem with noise and pulsing (constantly cutting on/off) simple wasn't there. The pump worked great and was quiet.I suspect the problem was caused by a flow restrictor fitting on the kitchen faucet. When off the dock and depending on the 50 gallons of water in my tanks I have to be frugal with water. Therefore I use a low flow restrictor fitting on the faucet. When at the dock and connected to the marina's water I use a normal fitting on the faucet. At this time I have not tested this theory by switching back to the low water restrictor fitting.ORIGINAL REVIEW BELOWPump appears to be good quality. Works well. All necessary parts were there for an easy install. But this is the noisiest pump I’ve ever had on a boat. It pulses with water pressure. I’ve never had one so this before.

Great product.I'm using it on an 8 row agricultural sprayer and it works very well.

Quietest pump we’ve used yet. Third pump we’ve installed over the life of our travel trailer. Will buy this again to have as a spare.

It works well and moves the water quieter than our original 2004 factory one. But, things are seldom perfect, and this is no different. When running the water at just a trickle (boondocking) the pump does cycle on and off. The pressure is consistent though. A little annoying hearing that on/off on/off... Not a problem for us, just figured people should know. Not sure about longevity, we've only boondocked a week or so since installing.

Installed this pump today and am very happy with the results. It is much quieter than the OEM pump that came with my RV, and water pressure is very good and consistent. The adjustable bypass makes for smooth operation without cycling even at low water volume. There are no clear instructions on this, but the videos are easy to find and follow.I do wish there were more options for fittings, for example one or two elbow fittings, but the ones that I received were good enough to allow for a professional-looking installation.This pump comes with a 4 year warranty and that should be long enough to work out any faults.Very happy for now but will update if any issues turn up.

I just ordered another pump like this, as I love my first one. I am using it to add a garden hose feature to a solar powered (12V) water capture system (two 330 gallon tanks) at a remote ranch in West Texas. My first pump has been sitting outside through 100 degree plus heat, thunderstorms and freezes (not recommended working conditions, but at this price, I figured I would take a risk). It has been working faithfully for well over a year.The pump provides the right water pressure to operate a garden hose with nozzle. We use it for everything from doing dishes when camping to cleaning hunting gear to taking makeshift showers.The beauty of this pump is how easy it is to install. No need for a pressure tank or valves or anything, just put it on your water line, add a faucet and you are done. (I added a little pressure meter downstream, but it turns out that that was not even needed.)The pump will automatically turn on when you squeeze the trigger on the garden hose (or alternatively, when you open the faucet) and turn off when you release it. The pressure and water flow (3 gpm) are just about ideal. If your water lines are tight (not leaky), the pump will almost never cycle.This pump is very easy to install, as the thread is compatible with standard 2” sprinkler PVC pipes, (same thread as most pop-up sprinkler heads) so you can easily install custom piping after a trip to Home Depot. And most garden hose faucets use the same thread on the “wall” side as well. Use teflon tape when you screw pieces together, and you will not lose a drop anywhere.The filter that comes with the pump is a nice feature to keep debris out when used in a rugged environment.