The coupling 88290019503 is a flexible rubber component used on Sullair portable screw compressors, such as the 550RH and 600XH models. Its main function is to reduce vibration and protect the drive system, allowing an efficient connection between the motor and compressor. It is designed to withstand demanding industrial working conditions and ensure the durability of the equipment. This coupling can be purchased as a spare part 88290019-503 Fits FOR Sullair Mobile Air Compressor 550RH Coupling