I'm trying to figure out how to use the damn thing! I had been using a piece of shit water aspitator vacuum station, but I bought this awesome pump used...practically brand new... but no owner's manual. Anyway, i thought I could figure out how to work it myself, but apparently I was wrong. I have figured out everything (with the help of PM's from an awesome bee...thanks man, you know who you are!) except the "gas ballast" knob. What the fuck does that thing do? I would still appreciate that manual when you get the chance though...peace