The 901c 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 901c meter is a 4 wheel mechanical meter designed for transfer pumps with a flow rate of 6 to 40 gpm. this meter has a 1 in. inlet and outlet.