The Drayton TRV4 Classic Thermostatic Radiator Valve with Lockshield is a high-quality central heating radiator designed for use with a hydronic heating system. Made of chrome with a rotary knob control style, this valve allows for easy adjustment of the heat settings and timer control. It is suitable for both horizontal and vertical radiator orientations, and comes with a thermostat included. Manufactured in the United Kingdom by the reputable brand Drayton, this valve is a reliable choice for maintaining a comfortable temperature in your home.