The BD807CMK Mechanical flow meter has a large easy to read display, flow ports can be positioned vertically or horizontally, UL/cUL listed, seals compatible for Biodiesel 21 to Biodiesel 100. Fill-Rite meters provide precision and durability in a cost-effective design. The BD807CMK 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. Includes pipe fittings to fit all 3/4 in. outlet pumps.