General description The 4 Pack Radiator Thermostat is designed for efficient home and office heating systems. Made from high-quality plastic and alloy, these thermostatic radiator valves (TRVs) are durable and resistant to deformation. They feature a user-friendly design with five modulation levels for easy installation and operation. Technical specifications Thread size: M30 x 1.5 Modulation levels: 5 Frost protection: Yes Material: Plastic and alloy Compatibility and accessories Compatible with M30 x 1.5 threaded connections of various radiator manufacturers. Installation Easy to install with a simple screw mechanism. To close the valve, turn the knob until the arrow points to 0. Usage Suitable for controlling water, non-corrosive liquids, and non-flammable gases. Automatically senses changes in outdoor temperature to adjust heating accordingly. Other information Built-in frost protection prevents radiator freezing in cold areas. High-definition internal structure design with a