The HD Series is the mother of all FASS pumps. The large filter capacity makes this pump untouchable on the pickup truck and the leader in the Class 8 market, where long stays on the road and high volume (up to 260gph) is required. Designed with the versatility to offer superior performance for the pickup and set the standards in the Class 8 market. The HD series provides strength and reliability you can count on even in the most extreme conditions.