This listing is for a Pack of 1 WRAS approved 22mm gate type pump valve with unrestricted flow, designed for infrequent use Suitable for hot and cold domestic water systems. Fitted to the inlet and outlet these valves are used to isolate central heating circulating pumps. Pump Valve Gate Type For Central Heating & Hot water Circulating Pumps Includes Fibre Washer For Domestic Pumps WRAS Approved suitable for All domestic Pumps type.