The pump works.. the manufacturer or should I say distributor knows NOTHING about this pump. I bought the pump and the instruction manual did not include the correct pump flow diagram. I reached out to vevor and they said they didn't have the flow information.. the listing also shows the pump has a check valve... it does not. The listing also states that everything is stainless steel... it is not. My pump was installed for less than three weeks and I had to pull the pump to install a check valve. See picture.. the pump is showing major signs of rusting coming from the internals of the pump. We will see how long it lasts.