These connectors are a waste of money. Industrial and Scientific is the last thing that comes to mind when thinking about them. Through trial and error, I found that they don't fit properly and are impossible to tighten. The only pro is that they are cheap, but you get what you pay for. The cons are endless - they leak, break easily, and simply don't work. Save yourself the headache and invest in a better quality fitting for your aquarium.
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