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SEALS UNUSED TAPPINGS: Closes off the unused top or bottom tapping on radiators and heated towel rails. 1/2 INCH BSP THREAD: Standard 1/2 inch BSP male thread fits most UK radiators and towel rails. EASY TO FIT: Tighten with a spanner or Allen key and seal the thread with PTFE tape. IDEAL FOR NEW RADIATORS: Many new radiators need a blanking plug fitting before installation. WHAT YOU GET: 4 x 1/2 inch BSP radiator blanking plugs.