Fittings too tight

Bought this kit to try and save some money and it ended up costing me more. The only useful part of this kit is the hose. None of the fittings in this kit screw on to the hose properly. Bought name brand fittings and screwed on the hose without an issue and they don't leak. I'll see how the hose holds up in the long run but I'm not optimistic.

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