MACK Industrial manufactures OEM and aftermarket components for oil free air compressors. Through the years the company has worked hard to develop the longest lasting OEM piston cup material on the market today. When this long lasting cup material is combined with MACK's proprietary cylinder sleeve technology the customer receives the highest level of durability an air compressor can achieve. We provide these piston cups and cylinder sleeves individually and in a kit form on our website: store.mackusa.com We also remanufacture air compressors at our facility in Sylvania, OH.