Description: R134A Refrigerant. Without zr1. Visual and leak-tested to help ensure the component's quality and durability The oil separator is part of the compressor and removes oil from the refrigerant to help keep system efficiency GM meets an aggressive engineering requirement for compressor clutch durability and corrosion resistance Together, these help ensure long-term quality and durability This GM Genuine Part is designed, engineered, and tested to rigorous standards and is backed by General Motors