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Vaillant Expansion Vessel & PRV Kit 964102 Greenstar ErP 30i Combi (GC No. 4740662) Alpha Diverter Valve Seal KitKit contains: Expansion vessel Pressure relief valve GasPart Vessel Kits make boiler pressure issue repairs as easy as possible. Good practice suggests replacing a PRV at the same time as a faulty vessel. A faulty vessel can cause damage to the PRV resulting in the boiler still showing a low pressure fault. Buying both together is simple and will help eradicate further problems.