12GPM Air-Operated Double Diaphragm Pump 115 PSI, Aluminum Alloy Dual Diaphragm Air Pump for Chemical Indutrial Liquid Low Viscosity Petroleum Fluids, 1/2" Inlet & Outlet

It works as it should. I have only pumped about 50 gallons so far but it worked well. The only thing I found wrong was there were a couple of bolts that were not tightened up when assembled.

Works well even holds up to bleach; only downside is that after running the bleach through it turns black. At first I thought it was packing grease and would stop but it hasn’t in many uses so I suspect that the bleach is turning black because of the diaphragm degradation.

It worked properly initially, however after 1 season of using it to pump water for irrigation of the garden the pump has lost most of its pressure. Right now it just sounds like it is pumping at full throttle, but water flow and pressure are almost null.

I bought two of the from Amazon. Both stopped working is six weeks. There is no customer support I can find and returns at Amazon are 30 days.You’ve been warned

Not impressed at all Small small small ‘ looks like a toy for my granddaughter!!!!! Haven’t used it yet to pump oil ‘ but I have a feeling I’ll be throwing it in the garage!!!!!