I'm happy with the pump. After reading other issues from other reviews I thought I would have some hiccups or extra parts needed during the install. I took the cap off the top of tank and replaced with the fitting that was screwed into my old pump (same threads luckily) for the return line even though no fluid flows through this line in order to seal the system. You could also use a breather which is just a cap basically with small holes to allow air but filter dirt out from the outside air but this seems to work for now so gonna leave it. It's faster and quieter than my old pump but that's cuz the old one was probably 10 years old and barley working. 5 stars so far will update if have problems later.