The pressure relief valve helps to control pressure build up within a central heating system. It is set to open in the event of a pressure build up releasing excess water to ensure the pressure within the system doesn't reach a dangerous level.
Worcester Type Safety Valve
Female x Female Connections
Technical specification
Waist Sizeab95cg11guToilet Cistern CapacityFTW--Supplier Part Number311430Brand NameAltecnic