that's exactly why i don't use the march pump to transfer beer, because i don't want to risk oxidation and or sanitation. On my SS conical fermenters and glass carboys, i use a stainless steel racking crane attached to a clear plastic hose to transfer the beer to a keg or what ever other vessel i need the beer in. I use a cork with two holes drilled, one hole for the racking crane, and the other hole for the CO2 inlet hose that exerts pressure and pushes the beer to the keg; it works even if one vessel is not lower than the other. Yet i am sometimes cautious to use CO2 pressure when applying it when racking out of my glass carboys. I just sometimes get freaked out about glass exploding.