The thermostatic straight radiator valves (pair) are made from solid brass & feature a chrome finish & the caps are made from chrome effect plastic so you can safely use the controls. The straight thermostatic radiator valves will perfectly complete the look of your heated towel rail or designer radiator. The easy to use thermostatic valves allow you to individually control the heat output of your radiator or heated towel rail. The thermostatic straight radiator valves have a 15mm thread.