Mechanical Oil Meter Dial/Digit Totals 99999.9 qt Dial Graduation 0.10 qt 0.30 to 8 gpm GPM Operating Pressure (PSI) 1 000 psi Inlet (In.) 1/2 in FNPT Outlet (In.) 1/2 in NPT(H) For Use With Biodiesel Diesel Oils with viscosity up to 2000 cst Includes Mechanical Register Oval Gear Mechanism Rubber Shroud on Meter