As I have posted before, I went through a few aftermarket pumps in the past, can't remember if they were Quantum or what, but they never worked. Bit the bullet and just bought used pumps from westsidepowersports.com as well. There are even some available on eBay as well. I have 2 sitting on the top shelf in the garage just waiting for one I use to fail. Nothing has proven to be better than OEM.....