The Wave Thermostatic Radiator Valve Set is specially designed for installation on either the flow or return pipework. Thermostatic radiator valves are used to prevent unwanted temperature rises and can achieve considerable energy savings. The Black Nickel finish looks great with designer radiators. This radiator valve set comes with both a thermostatic valve and a lockshield valve, both with standard 1/2″ radiator connection and 15mm pipe connection. Further more it has six settings on radiator thermostatic valve including frost protection and a 2 year guarantee for peace of mind.