Detail 3pcs Thermostat Radiator Valve TRV Thermostatic Radiator Head M30 x 1.5 Radiator Valve Head Replacement Radiator ValveUpper Limit of Zero Ratio: 0,*,1,2,3,4,5It has anti-freeze and adjustment functions, which can provide adjustment aidThere is no fixed adjustment range, it is affected by the preheating temperature and room temperatureBy marking with arrows, you can easily find the temperature you wantSuitable spool size: 15mmNote: 5 levels of modulation, easy to install, if you want to turn off the thermostat, just use the modulation index arrow 0.Color: White Material: Copper + ABS Measurement: 85x50x33mm Package Content: 3 x M30x1.5 thermostatOnly the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement error is +/- 1-3cm.