What is a pipe nipple that is threaded over its entire length called?

A pipe nipple that is threaded over its entire length is referred to as a close nipple. This type of pipe nipple is used to connect two fittings closely together without any space in between, making it an efficient choice for applications where minimizing the length of the pipe connection is necessary. Close nipples are particularly useful in tight spaces, ensuring a secure and compact fitting.

In contrast, other types of pipe nipples serve different purposes. For instance, a coupling nipple typically has a larger diameter in the center and threaded ends that accommodate connecting two pipes of the same diameter. A reducing nipple, on the other hand, features different diameters on its ends, allowing connection between pipes of varying sizes. An exposed nipple simply describes a situation where the nipple is visible or not covered, which doesn’t convey specific characteristics of threading or function like a close nipple does. Understanding these distinctions helps clarify the specific applications and types of adaptations necessary for various plumbing or construction needs.