i cleaned my prefilter out and it was nasty waster had caused the metal to start corroding the threaded stud. i guess i got some parts cleaner on the gasket that seals the canister to the bottom of the fixed housing b/c when i set the gasket back in it position it was too small to fit. now its leaking. does anyone have a part# for this seal. what kind of tq do i need to put on it?