The pressure relief valve helps to control pressure build up within a central heating system. It is set to vent as pressure increases to ensure the pressure within the system doesn't reach a dangerous level ..
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Technical Specifications
TypeTemperature & Pressure Relief ValveToilet Cistern CapacityFTW--Supplier Part Number97783224Brand NameRedring
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Redring 97783224 T&p Valve 7BAR 90 C. HT575 LW50-100