Four Seasons 57942 Remanufactured R4 Lightweight Compressor with Clutch All remanufactured compressors are built using the latest compressor technology available today and using strict remanufacturing processes. Tested for noise, vibration, durability, vacuum decay, and pressure decay to ensure no leaks and longer life Contains R-12/R-134a compatible gaskets, o-rings, or seals to properly replace the product Built in a TS16949 certified manufacturing environment to ensure consistent quality that meets or exceeds OE specifications for fit, form, function, and durability