The Westron® QD91H Compressor is made of high quality materials. This compressor incorporates a durable electric motor, oil-free pump, and an internal EMI filter. The unit also features a high efficiency heat transfer tube design that allows for efficient heat exchange between refrigerant gas and liquid, ensuring quieter performance and longer life span. Westron® QD91H compressor is a reliable and durable compressor. Its high performance design makes this unit excellent for commercial and home use. It is made of quality material to ensure its long-term durability.