Thank you for your efforts looking that up and explaining. I contacted the dealer this morning and they have them in stock. I will be picking one up Saturday morning and seeing if can get it fixed.Key 20 is P/N T77932. It is for a -10 ORFS fitting. -10 is 10/16 or 5/8. If you have a local hydraulics shop closer, ask for 5/8 ORFS O-ring or a -10 ORFS O-ring (both are the same thing)