Rotary Vane Pumps with Manual Nozzle, 20 gpm, Rotary Vane Amp ORS NASCO and valve packing nuts Extra wide opening and valve packing nuts Extra wide opening offset model is ideal for securing drain nuts on sinks and tubs vinyl covered steel case Yellow clad tape Large easy action winding drum and friction washers Nylon rollers guide the tape smoothly in and out of case Their rugged motors are explosion proof and rain proof to ensure a long life of dependability Heavy duty cast iron construction Carbon vanes and ceramic carbon seals reduce wear and repair expense Integral check valve with pressure relief on outlet side reduces pressure drop and improves vertical lift Self priming