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WRAS Approved for Water Systems - WRAS approved 22mm copper press fit couplers for potable hot and cold water installations, closed-circuit heating, chilled water and oil-free compressed air systems. 22mm Straight Couplers - Equal press x press fittings made from high-quality copper and copper alloy with durable black EPDM O-rings, designed for 22mm copper tube to BS EN 1057 R250 and R290. Requires an M Profile Press Tool - Install using a compatible press machine with 22mm M Profile jaws. These are press fit fittings, not push fit, compression or solder fittings. 16 Bar Working Pressure - Rated by the supplier for operation from -24°C to 110°C at up to 16 bar when installed within the specified system limits. Trade 10 Pack - Ten equal 22mm copper press fit straight couplers for plumbers, heating engineers, maintenance teams and multi-job installations.