A washer needs to be added to this bulkhead to work properly. Two standoffs are placed between a flanged nut (good) and the receptacle side of a flangeless connector (bad) to support the rubber gasket. A washer really needs to be added to properly seal/tighten this gasket. As such it's semi-functional, but anyone using it to seal a liquid vessel is advised to add a washer or look elsewhere.
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