ClimateMaster 33B0002N06 Valve R 22 Proven Durability: Incorporates class B Proven Durability: Incorporates class B insulation and an integrated thermal protection system to safeguard against winding failure this OEM assembly ensures drop in compatibility and restores the factory specified performance of the liquid line metering system without the need for field modification or custom sizing calculations The ClimateMaster 33B0002N06 Thermal Expansion Valve is a critical OEM replacement part engineered for precise refrigerant metering in high efficiency water source heat pumps and commercial refrigeration units which is essential for systems with significant pressure drops across the coil