The 15mm Drayton TRV4 Anthracite Angled Thermostatic Valve & Lockshield is a central heating radiator valve designed for use in heating systems. This valve, from the trusted brand Drayton, includes a thermostat for precise temperature control and has a stylish anthracite finish. Perfect for maintaining a comfortable and efficient heating system in your home, this product is a reliable addition to any central heating radiator setup.