Male threads are on the outside, like a bolt. Female threads are on the inside, like a nut. The male threads screw into the female threads. … No matter, it is a plumbing fitting with external threads that screw into something else, so it is considered a male fitting.
threads on an external surface are considered male, while the ones on an internal surface are considered female. For example, a screw has male threads, while its matching hole (whether in nut or substrate) has female threads. This property is called gender.
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