This 1-inch motor speed pump has long been popular for cylinder filling, small volume motor fueling and supplying small vaporizers. It offers the same heavy-duty construction of larger Blackmer models and is available in two mounting styles and capacity ranges. The LGF1 model is fitted with an integral bracket and coupling for direct flange mounting to a NEMA C-face motor. This bracket also allows the pump body to be rotated to simplify hookup to piping systems. The LGF1 model will handle up to 10 U.S. gpm (38 lpm). The LGF1P model offers 50% greater capacity and will handle up to 15 U.S. gpm (57 lpm).

The LGF1 model has a 1-inch NPT tapped ports and use an exclusive "combination" valve that acts as both a back-to-tank bypass valve and as an internal safety relief valve. This feature lowers installation costs by eliminating the need for a separate bypass valve. It also assures pressure relief if the back-to-tank bypass line is closed.

Standard construction materials for this model includes Buna-N mechanical seals and Duravanes for handling both LP-gas and anhydrous ammonia. Optional viton fitted mechanical seals and laminate vanes are also available. Maximum differential pressure is 126 psi (862 kPa) for both models.