The 901CMK4200 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 901CMK4200 meter is a 4-wheel mechanical meter designed for transfer pumps with a flow rate of 6-40 GPM. this meter has a 1 in. inlet and outlet package has fittings to install in the 4200 Series pumps