1/2'' Radiator Valve Spanner High tensile steel Hexagonal size: 1/2 inch (12.7mm) with spline Square with bleed valve clearance 1/2'' Radiator Valve Spanner A radiator valve spanner helps avoid bending pipework when the union nut of a manual, thermostatic or lockshield radiator valve is undone or tightened. It is designed to facilitate the easy fitting and removal of standard and thermostatic radiator valves. This fits around 1/2" valves and holds the valve in position. Perfect for use when water pump pliers or an adjustable wrench would mark or damage the pipe. Also designed with a comfortable, slightly offset, handle. Features Fits most 1/2" radiator valves, back nut box spanners, taps, pumps, and cabinets. For tightening and loosening radiator valves. Made of high-quality material for long-lasting durability.