Air Conditioner CompressorChrome6-Groove Serpentine PulleySanden SD508 StyleR134A Refrigerant-08AN & -10AN ConnectionsPre-filled with SP-15 OilMade in the USA While this compressor is advertised as having a 6-groove pulley, it is provided with a 7-groove pulley. It is designed for use with 6-groove belts and allows for minor adjustments in belt alignment. Use of a 6-groove belt on a 7-groove pulley will have no negative impact on belt wear or engine-driven accessory efficiency.