This Peterbilt and Caterpillar Accumulator Drier is a natural finish product that fits most Peterbilt and Caterpillar models. It is sold individually and is compatible with OEM and aftermarket numbers 176-3900, 33221, 1411366, 176900, and 74R5061. This product is practical and beneficial for those in need of a replacement accumulator drier for their Peterbilt or Caterpillar vehicle.