As many others say they are not perfect out of the box. I ordered two and after reading several reviews carefully inspected the plastic washers for cracks and leaks. Everything checked out fine. I squeezed them and checked for leaks. Couple of wrenches to tighten the nuts and now there's no more air leaking out. I thought I was clean. Filled PB blaster, pressed and button pressed. All I got was dribbling. After inspection I would say that the nozzles were clogged with metal seals. The company must not have washed the jars after cutting the threads because there were a lot of fillings. After gassing them and then cleaning and reassembling them, everything worked great. So let's summarize. They work well but assembly is cheap. You will need some time to inspect the plastic washers, tighten the nuts and flush them with solvent before use. So about 1/2 hour of work and maybe a couple of copper washers or rubber o-rings and then you have something that performs about the same as a more expensive brand.
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