I ordered one yesterday from ************** to eliminate some of the potential air leaks, I could have bought just the hand pump for $19 but I also bought the entire lift pump that came with it. entire thing brand new was only $120, so I figured why not? however being that this unit is located AFTER the pre-filter (where I am seeing the air bubbles entering) I do NOT think this is the primary source of my air leaks, but I have little doubt that it at at least a contributor to the problem...