Pin

In plumbing, a pin refers to the external (male) threaded end of a pipe, fitting, or component designed to connect with a corresponding female threaded connection. Pins are found on various plumbing fittings, including couplings, adapters, and nipples, facilitating secure and leak-proof connections. The pin is typically tapered, allowing for a tight fit when combined with sealing materials like Teflon tape or pipe dope. Proper threading, sealing, and tightening of pins are essential for maintaining pressure integrity and preventing leaks in plumbing systems.