Siemens MTN51-GBL thermostatic radiator valve with a sleek, liquid-filled head for precise temperature control. Designed for 10mm inlet and 15mm outlet connections, the angled brass body is chrome-plated and includes a 10mm push-fit elbow for easy installation. Features frost protection, temperature limiters, EN215 approval and reverse-flow fitting for reliable, energy-saving radiator control. Ideal for residential heating systems 2 year guarantee.