Lincoln High Volume Fuel Meter, UL Approved for gasoline & diesel fuels. Meters light weight petroleum base products by Pump or gravity flow. Volume flow of 3 to 38 gpm. Calibrated in U.S. Gallons, 1/10 gallon graduations. Straight readout to 999.9 gallons, reset knob on Meter Body, non-reset Meter on face. 50 psi max Pressure. 1" NPT(f) inlet and outlet. Not for resale measurements.