Do you have a worn or missing O-ring for the Fermenator Pressure Relief Valve? Over time, O-rings will wear down, fray and eventually disintegrate. A missing or faulty O-ring can mean the difference between a successful brew day and wort leaking all over while you curse your bad luck. Replace that O-ring, or have backup on hand just in case! The Fermenator Pressure Relief Valve O-ring from Blichmann Engineering is the perfect replacement for your Fermenator!