This 8PK1050 multi-ribbed fan belt is used for heavy truck engine cooling fan and accessory drive system. It transmits power to drive fan, alternator, air compressor and other engine accessories. Made of high-strength EPDM rubber with strong polyester tension cords inside. Excellent heat resistance, wear resistance and low stretch under continuous high-speed operation. Stable friction transmission, less slipping even under heavy load and high temperature. Each belt undergoes tensile and fatigue durability testing before factory shipment. Replaces cracked, hardened, slipping or broken old belts on engine accessory drive. Essential consumable spare part for heavy truck engine maintenance.