Happybuy Air-Operated Double Diaphragm Pump 1 inch Inlet Outlet Aluminum 35 GPM Max 120PSI for Industrial Use, QBY4-25LF46-1inch-35

Work perfect great price

This pump is a sad joke. It pumps, barely. I bought the unit allegedly rated for 13 gallons per minute.It's not even close. The pump is extremely loud and could barely pump 1 gallon per minute. At the same time, the pump uses huge amounts of compressed air. My unit arrived with bolts crossthreaded, so it will be very annoying to try to service it.More likely I will just toss it. $155 for a fraudulent piece of junk.Sadly, I didn't have time to put it to the test after Amazon's "return window" had closed. Nonsense! Stop selling this crap. I would give it zero stars if I could. Total ripoff.

Pump ran fine for 6 months then failed, no product support or warranty. Sold by Amazon but Amazon says not supported.

work better than i thought it would

The media could not be loaded.  Poly 1 inch pumpWe use dayton, aro, and wilden pumps - whichever we can get cheapest used, and usually just swap out the diaphragms and they're good to go. I thought I'd give this mystery pump a try.I don't know what the diaphragm material is. Santoprene is a proprietary blend by Exxon, and I don't think it's santoprene. 100% guessing, I would say ptfe (the white part) with some rubber, maybe neoprene, backing. Time will tell. And if some mild chemicals I feed it react.The balls were also a simple white plastic. Lots of this blue rubber used on o-rings/gaskets. Probably same as whats behind the white diaphragmI originally disassembled it out of curiosity on the diaphragm, but mine had a mysterious RUSTY WIRE in it. I lost the picture I took of it, but it would have certainly caused FAILURE. The diaphragm had some weird rusty powder on both sides. I did not put the rusty wire in there. Rust is common in my business, but I really have no idea. I'm assuming it was the manufacturer, but nobody is that stupid, right? If you don't want a flood, check for operation (1) dry with some air, (2) wet partially submerged BEFORE you put those flanges on ANYTHING.Oh, I was also hoping the flanges were combo 1" fpt & flange. Nope, flange only. Buy some flanges.I'll come back in 6-12 months. I'm using it to pump dilute nitric acid at 130 - 160 F with some grit in it to a treatment tank. Yes, the Wilden pump we used for this was max 150 F too... oh well. Wilden made it about 15 years with repairs every 5 or so. If this sucker makes it a year (for 1/4 the price of Wilden), I'm ecstatic. If it makes it 3 years, our warehouse will become the HappyBuy Hub. I'm happy to throw a torn diaphragm pump in the trash instead of the 4 hour repair session, of which 1/3 is safely removing and reinstalling the pump, and is usually doubled when a seal gets a grain of sand in it. Then it's an all day affair. Of pain and suffering. Thats enough rambling for now.NOTE TO MANUFACTURER: please tell us the real material of construction; diaphragm and backup diaphragm, as well as check balls. I don't think it's actually Santoprene...I'll update in a few months on its performance. Ran for an hour today as a test.EDIT 3/4/2019: Still running strong. Feeds 160 F dilute (<3%) used phosphoric acid, outlet is 5-10 psi.

Tested — I have a ARO $1200 —& this happy buy-is putting out the same performance at this time — not sure how long it’s going to last though very happy with the purchase & just ordered 2 more & please note: I am using a half inch hose & reducing to a small tip for maximum height in spray chemicals inside of a ship & reaching about 42 feet…

Very poor construction. I bought 2 of these and one had a pinhole leak in the casting so I got another one to replace it and it leaked worse than the other one. Don't buy.

Ues it to pump hydraulic oil when doing service on machines, work great and fast.

Used to pump oil and works well

Deux achats en une année pour deux départements différents dans notre usine, économie de plus de 300$ / pompe achetée!

Compacta y eficiente

USE IT TWO TIMES THEN IT WOULD WORK ANY MORE

Pump the calcium out and back into my tires, I pumped just under 10000 liters