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RELEASE TRAPPED AIR: Open the bleed screw with a standard radiator key to let out trapped air so the radiator heats evenly from top to bottom. 1/2 INCH BSP THREAD: Standard 1/2 inch BSP male thread fits most UK radiators and heated towel rails. REPLACE A LEAKING OR LOST VALVE: Ideal for replacing a damaged or seized bleed valve, or fitting new radiators. EASY TO FIT: Seal the thread with PTFE tape and tighten with a spanner or Allen key. WHAT YOU GET: 4 x 1/2 inch BSP manual radiator bleed valves.