If your keg is losing pressure, first check the poppet valves, but the next most likely suspect is the pressure relief valve. This is the last pressure relief valve you'll ever need to buy!
New and improved design! Features replaceable o-ring seal - this is the last pressure relief valve you'll ever need to buy!

Pressure relief valves: If your keg is losing pressure, first check the poppet valves, but the next most likely suspect is the pressure relief valve. Many keg lids are compatible with the Cornelius keg, so check the photos to make sure you are ordering the correct valve. Pressure Relief Valve. Cornelius Ball Lock Kegs.