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COMPLETE RADIATOR END SET: Each set contains a manual air bleed valve and a blanking plug for the two top tappings of a radiator or towel rail. 1/2 INCH BSP THREAD: Standard 1/2 inch BSP male thread fits most UK radiators and heated towel rails. BLEED TRAPPED AIR: Open the bleed screw with a radiator key to release trapped air so the radiator heats evenly from top to bottom. SEAL UNUSED TAPPINGS: The blanking plug closes off the unused top tapping. Use PTFE tape or a suitable sealant on the threads. WHAT YOU GET: 2 x radiator bleed valve and 2 x blanking plug.