As I'm writing this, the original Drinkwell pump is twice the price (here in Canada) and is virtually the same pump. Perfect fit, no tinkering required ; all you have to do is remove their little output adapter (pulls out) and re-use the original long grey plastic tube that slides into the pump. My original pump is still working after 3+ years, but the slotted water entry cover was in bad shape... so I figured it was time. And these motors don't last forever. Love this new one.