While doing so i noticed the check valve is 2 piece (is clipped together like a electrical plug) being curious and to check if it was dirty i opened it up. I wasnt expecting piece's to fall out. There is a small black disc and large black disc then a O-ring. I'm pretty sure i know how the big disc goes in as well as the o-ring but am puzzled on the small disc check valve. Does anyone have a schematic that shows a break down, or has any one else opened one up. I dont want to spend 20 bucks on a new one when this one is fine. I have searched for threads and asked ?'s but havent had much response so i thought i would start this thread. Someone please help me out. I will buy a new one before i leave it out for 20 bucks, but would rather just figure out how the pieces set in there. I cant believe everyone just tosses them or buys a new one though. Hopefully i can save a bill and get this thing back together.