While designed as a direct fit

the reset start point is field-adjustable from 0 to 10 psi to match the specific branch signal of the master thermostat

it serves as a primary safety boundary against overheating

Enhanced Safety: Captured springs prevent accidental energy release during disassembly in the field

Copeland 970-0021-00 Sight Glass Kit 320819-301 While designed as a directThe Copeland 970 0021 00 Sight Glass Kit is a specialized service component designed for professional integration into compatible Copeland semi hermetic compressors. This kit provides technicians with a direct visual interface to monitor refrigerant level and oil condition during system operation. Engineered for high pressure durability, the assembly includes a heavy duty sight glass, high performance O rings for a leak proof seal, and corrosion