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They all should be that way. They make the threads slightly oversize, so when you screw them together the threads will make a water tight seal. It is the same with metal pipe.
If you use both O-rings (one on the inside of the bucket and one on the outside), the fittings will screw together by hand and form a good seal. You might need to use a wrench on a few of them, but be careful not to over tighten. You want both O-rings to be compressed a little. If the O-ring starts to push out, back off a half turn.
This setup will be water tight, but not so tight you cant rotate the fittings. I feel your pain man, I did the same thing when I first started to work with PVC.
R.
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