The WS4500/5500/7500 series of air compressors are the new compressor products developed by Sullair Asia Industrial Co., Ltd. based on the previous LS 16 series. The products use the brand new industrial design and integrated structure, with optimized overall design using the U.S. OEM compressor air end, high efficiency NEMA motor, optimized pneumatic inlet and discharge systems, thereby offering stability and reliability in overall performance worth anticipation. The machine unit also offers converter apparatus for the convenience of users.