and a durable plunger tube

It is optimized for use with environmentally friendly refrigerants including R134a

providing a reliable seal for high-pressure refrigeration cycles

What does the brown color code signify

Johnson Controls GRD10A-608 Plastic Guard Els PW 17895 and a durable plunger tubeThe Johnson Controls GRD10A 608 is a professional grade clear plastic thermostat guard engineered to protect critical climate control interfaces from unauthorized adjustment and physical damage. This heavy duty thermostat lock box is specifically designed for commercial HVAC protection in high traffic environments like schools, hospitals, and industrial facilities. Constructed from impact resistant Lexan, the GRD10A 608 ensures clear visibility of