A replacement pull-ring style relief valve for your Corny Keg but they are compatible with other products such as the MK4 Regulator. These pressure relief valves are made to the cornelius standard and are compatible with cornelius type kegs.
These are accurately made and batch tested for consistency. This important safety mechanism has been manufactured to tight specifications to ensure it’s reliability.
Please be aware that these pressure relief valves should be clean to work correctly. If dried up beer or sugar gets into the pressure relief valve then clean this out immediately as this can effect the safe working and opening pressures.