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 Flexible head Knurled side beam for ratcheting direction indicator 72 teeth ratcheting box end needs as little as 5° to move fasteners versus 30° for standard box end wrenches Surface Drive® on box end provides off corner loading for better grip and reduced fastener rounding 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