WIWA Profit Series Model 4222 22:1 2552 PSI @ 0.43 GPM Airless Sprayer Unit w Pail Carbon Steel (Bare) 11670 15365 The magnetic air motor has ID:3 8" The magnetic air motor has a no stall trip mechanism that insures smooth pump stroke transition with no surge or wink in the spray pattern while maximizing transfer efficiency Electric Pressure Control Type Pressure Control Knob Product Series ProContractor Pump Mount Type ProConnect 2 Pump Rod Type Hard Chrome Pump Sleeve Material MaxLife Pump Type Endurance Recommended Annual Usage 100 200 gallons per week Series GH 230 Type Airless Sprayer Volume Per Cycle (cycles gal) 80 Weight (lb) 199 Wetted Material Acetal Spring supported As Airless spraying unit: robust an handy for efficient painting and coating