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some bulkhead fittings are made so that you glue the pvc pipe into them, others have female threads in the neck and you screw in a connector. i have seen some that are female inside the neck and have male threads of a much larger size on the outside of the neck.
especially interesting is the bulkhead fitting with reverse threads on the nut. after installation, if you screw a pipe into the fitting tightly enough to turn the neck, the nut will tighten further instead of loosening!
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