Heavy Duty Vacuum Pump FAD 6CFM 9CFM / 10CFM, Dual Stage; Power: 1/2HP or 1HP; Ultimate Vacuum: 0.3Pa. Our HVAC vacuum pump comprises heavy-duty aluminum alloy with durability and sturdiness. The strong copper motor provides continuous power, and a shock-proof base supports the stable operation. Backflow Prevention: The refrigerant vacuum pump avoids chamber contamination by preventing oil from flowing back, otherwise polluting its container and tubes. 1/4" oil fill port makes oil adding simpler since the port is accessible from the front or either side. Oil drain hole makes oil drain faster, and the gas exhaust port can efficiently avoid oil spout. Easy Monitoring & Cooling With an oil viewing window this AC vacuum pump can easily monitor oil levels to avoid oil deficiency Our vacuum pump tool can cool itself and prevent itself from burning out The builtin thermal protection prevents the machine from burning and extend the machine's life. Ergonomic Grip Handle: The ergonomic grip handle is designed for superior comfort and portability. With the convenient handle, you can easily carry the vacuum pump to its destination. Wide Application: The vacuum pump is widely used for commercial and household applications, suitable for cleaning a household air conditioner, automobile maintenance, vacuum packaging, refrigerator vacuum, industry, etc.