The Straight Anthracite Euro TRV Radiator and Towel Rail Valves are for 50mm underside pipecentres and have standard 1/2" BSP connections and 15mm pipe connections allowing you to fit your radiator or towel rail onto your central heating system and control it thermostatically. Our valves are comptaible with 15mm to 10mm reducers if you need to install onto microbore pipework, these would need to be purchased seperately.