The 807CMK mechanical flow meter has a large easy to read display. flow ports can be positioned vertically or horizontally. UL/cUL listed. handles fluid of any viscosity. rated for gasoline. diesel. kerosene. mineral spirits. Stoddard solvents and heptane. Fill-Rite meters provide precision and durability in a cost-effective design. The 807CMK is a 3-wheel mechanical meter designed for transfer pumps with a flow rate of 5 to 20 gpm. This meter has a 3/4 in. inlet and outlet. In package. pipe fittings to fit all 3/4 in. outlet pumps.