Gem Bids For 1. Part No. 281.00. 363.50 Compression Ring Of Hp Pistonfor Main Air Compressor, Make: Kpcl, 2. Part No. 281.00.364.50 Wear Ring Of Hp Piston For Main Air Compressor, Make; Kpcl, Part No. 281.00. 612.50 Outer Ring Of Pistonunloader Assembly Of Lp Piston For Main Air Compressor, 4.part No. 999.12. 278.00 O-ring Nitr Piston Unloaderassembly Of Lp Piston For Main Air Compressor