Fits Bauer compressor - 22 Series (oil). Ships with gasket for Bauer units. Supplied gasket does not work on Coltri compressors. Installing Bauer gasket on a Coltri unit will cause oiling issues with the compressor and will void all warranties. Used on Coltri units through 02/2018. For Coltri units, use O-Ring SKU 13-01-0013.