Danfoss RAW-K Sensors thermostatic radiator sensor, OEM order code 013G5136 — a self-acting thermostatic operator (sensor head): the liquid-charged sensing element expands and contracts with room temperature and drives the valve cone, throttling flow to hold the set room temperature with no external power. It fits Danfoss and other manufacturers' radiator valves with an M30x1.5 connection via the M30x1.5 connection (metal nut fixing) and needs no wiring or batteries. Temperature setting range 16 °C to 28 °C; sensing charge liquid; housing colour White RAL 9016. The head provides maximum/minimum temperature limiting and set-point locking with concealed pins under the dial. Genuine Danfoss part; technical data quoted verbatim from store.danfoss.com (code 013G5136). OEM P/N 013G5136, EAN 5702420091983. HS 9032.10 (thermostats). Modulates refrigerant flow to the evaporator in response to superheat at the evaporator outlet.