1)Heavy Duty Vacuum Pump: Vacuum pump is made of a heavy duty aluminum alloy which gives it durability and strength. The powerful copper motor provides continuous power and an anti-shock base ensures stable operation. 2)Reflux Prevention: The refrigeration vacuum pump prevents contamination of the chamber by preventing oil from flowing back and polluting its container and tubes. The 0.6 cm oil filler port simplifies the addition of oil since it is accessible from the front or from both sides. The oil drain hole can drain the oil faster, and the gas vent hole can prevent oil spillage effectively. 3)Easy Monitoring & Cooling With an oil viewing window, this automatic air conditioning vacuum pump can easily monitor oil levels to prevent oil starvation. Our vacuum pump tool can cool down and avoid burning out. The built-in thermal protection prevents the machine from burning out and prolongs the life of the machine. 4)Ergonomic Handle: The ergonomic handle is designed for superior comfort and portability. Thanks to this practical handle, you can easily transport the vacuum pump to its destination. 5)Various Uses: The vacuum pump is widely used for commercial and household applications, suitable for home air conditioner cleaning, car maintenance, vacuum packaging, refrigerator vacuum, industry, etc., Manufacturer: MMHHHG