The 807CMK mechanical flow meter handles fluid of any viscosity, rated for Gasoline, Diesel, Kerosene and Mineral spirits. Features: 3/4" inlet and outlet, 5 -20 gpm, max. pressure 50 PSIG, meter digit indication; up to 99.9 gallons (resettable), totalizer digit indication; up to 99,999.9 gallons or liters (non-resettable).