Good little pump for the money. I'm just experimenting and don't want to invest too much. It reads -29.5 on my meter no matter what it takes. I have a lab double stop that can handle -28, but I wanted something less. This is the first oil seal pump I've used and overfilled resulting in a mess of oil splattering into the chamber as well as into the exhaust. So don't do that ;-) after draining and cleaning some, it works fine and is no louder than a diaphragm pump.
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