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Бесплатная доставка. Features: Integral cylinder structure, high precision and high limit vacuum. Forced lubricating oil pump to ensure high reliability. Large front oil window design to prevent oil shortage. Anti-reflux design, effectively prevent pump oil from entering the system. It is suitable for air conditioning, refrigerator, heat pump and other refrigeration piping system. The pipe should be short. Then check whether the inlet connection is tight, and whether the pipe is sealed and reliable, no leakage is allowed. Remove the exhaust cap from the catcher, turn on the power switch, and the pump starts to run. After the pump is used, close the valve between the pump and the suction vessel, close the power switch on the pump and unplug the power plug. Note: Please kindly make a note if you need any adapter. Any questions, pls.