The Volvo/Mack Charged Air Econodyne - 3 Groove Pulley is a practical and reliable product that fits most Mack E6, EM6, and EMS-6 engines. With a 6-5/8" diameter pulley and OEM pump numbers 316GC1210AX and 316GC1210A, this pulley is designed to provide optimal performance. The included pulley and OEM casting number 360GB443 make installation hassle-free. This product offers excellent functionality and durability, ensuring long-lasting performance for your Volvo or Mack vehicle. Trust the Volvo/Mack Charged Air Econodyne - 3 Groove Pulley for efficient and reliable operation.