Thermostatic Radiator Head ----- The professional TRV 3-piece thermostat with M 30 x 1.5 threaded connectors and is suitable for radiator manufacturers' 30 x 1.5 threaded connections. 100% brand new and high quality---The thermostat head TRV is made of high quality material, which is durable and convenient to use. Fine workmanship and good performance. Easy to use with long life. Clever details ---- The radiator valve TRV with frost protection and adjustment function, can provide adjustment assistance and with liquid sensor and zero position. Suitable for compact radiators with integrated valve set. The zero adjustment ratio is 0, *, 15 No fixed temperature adjustment range ----: This TRV thermostatic radiator head has no fixed temperature adjustment range. temperature setting, affected by heating temperature and ambient temperature can detect external temperature changes. Note --- Please confirm if this TRV thermostatic head is suitable for your valve before purchasing, and head is included only - valve body is not included. The applicable coil size is 15mm, if you need to turn off the thermostat, just use the modulation index arrow 0. If you have any problem, please feel free to contact us.