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 Bio Diesel 21-Biodiesal 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" inlet and outlet. In package, pipe fittings to fit all 3/4" outlet pumps.