I am a retired professional mechanic who maintains my vehicles myself. I used a 55 gallon barrel pump at the store. It's almost the same. Great tool with added value! This is a fantastic way to service oil in a differential or AWD transfer case. My only complaint. There should be an instruction manual. Neither of them were included in the box. The only odd process is the need to use a transmission oil suction device to service the car's transmission oil pan. I tried disconnecting the tool tank from the top to fill the gear oil from a gallon container. It was firmly glued. It worked fairly well with around 50psi of shop air for both extracting (filling the block) and pushing transmission fluid from the tool tank into the vehicle. Less wrist pain and easier flow. It's much easier than using a hand pump to service a quart or gallon of gear oil. I bought one or my store and will buy a second one with a different type of lube. My 3 sons will most likely buy one too if I can leave mine in the store. Rschunimagu.
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