After reading the negative reviews about it I decided to take a chance and ordered it. I believe that after receiving the pump, filled with oil and tested, it only took a few minutes to get it working in my chamber. It dropped to 30 Hg in about 2 minutes. The pump produced some oil while running, but that was to be expected. The oil cap leaks a little around it, even if it's not properly tightened. There is enough oil in the pump to fill it and a little more. So don't throw the whole container in. Top up, let run for a few minutes, then check levels and top up to be safe. All in all, everything was up and running in minutes and worked great for the price. I'll come back to this for an update in about a month, but right now it's working like a champ!
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