You Are Looking at A OIL-LESS VACUUM PUMP: Twin Piston 1/2 HP 4.5 CFM, Good for Goat or cow Milker Pulsator Hookup, Medical, Laboratory and Workshop Applications. Save the oil mist problem and Save the oil on the run! Zero maintenance cost and trouble free.More pumps available at https://viot.us/HVAC or with milker at: https://milkersupply.com FEATURES: OIL-free twin piston vacuum pump; Designed and manufactured with the highest quality in materials and workmanship; Quiet run at wide temperature ranges, from subzero to 110 degree F, start in cold weather. Flow Rate: 4.5 CFM; Max Vacuum: 25 inch Hg; Thermal protected 1/2 HP motor; Power Supply:120 VAC, 60 Hz; Insulation Class B; Come with 5 ft power cord with UL plug; Capacitor: 60 uF, cased in and protected; Come with 4 rubber feet to reduce/absorb vibration and noise; Physical Dimensions: Size: 11 X 6 X 8 inch; Shipping Weight: 28 lb. Intake Port: 1/4 female NPT; adapter to 1/2 barb; mini muffler on the exhaust port for quieter operation;One year warranty; Packing List: Vacuum Pump, one unit Intake Port adapter: 1/4 male NPT and Adapter to 1/2 Barb, one unit Muffler for the exhaust port: one unitUser Manual: 1 copy