Single Universal Replacement Radiator Valve Cap Designed to fit most 1/2" / 15mm radiator valves Simple to apply with just a screwdriver White Easy to install For use on wheelhead & lockshield valves Easi Plumb Universal Replacement Radiator Valve Cap Head - White The Easi Plumb Universal White Replacement Radiator Valve Head is all you need to replace a broken or missing radiator valve head. This head is designed to fit most 1/2in valves and are easy to install with a screwdriver. This valve is suitable for use on both wheelhead and lockshield radiator valves.