I finally got around to using this on my gearbox and it has worked great. The liquid was cold, but this pump could pump all the liquid out of the sump. I have used both a manual pump and an automatic air nozzle, I recommend using an air nozzle if you don't have a compressor. I was able to bleed over 4 liters of gear oil in less than 5 minutes. It's a lot easier than draining it under the car. I plan to use it for all my vehicles and my small engines. Highly recommended.
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