Heavyweight Thermostatic Radiator Valve (TRV) and Lockshield set. Valve to Radiator: ½” BSP Coupler. Valve to Pipe: 15mm Compression. Max Operating Pressure 10 bar. Max Operating Temp 40°C. Cartridges can be swapped from one body to another to change the flow and return side. As these valves are non-bidirectional, you can also use a bypass valve to stop any potential radiator hammer. Supplied with a decorator cap and one wheel head.