Blackmer® TLGLF Sliding Vane Pumps are flanged mounted propane truck pumps. UL listed for propane, butane and anhydrous ammonia, these pumps come in three models: the 3-inch TLGLF3, the 3-inch TLGLF3HD, and the 4-inch TLGLF4. With a max flow rate of 425 gpm (1,608 L/min) the TLGLF4 pumps are designed for transport loading and unloading. Whereas the TLGLF3, designed for bobtail truck use, features a flow rate of 140 gpm (530 L/min) ideal for smaller tank vessel sizes. With an increased flow rate that is 55% greater than the TLGLF3, the TLGLF3HD model features flow rates of 180 gpm (681 L/min), ideal for high-capacity bobtail trucks that often have 7,000 gallon sized tank vessels.