The unthreaded portion of gas piping outlets must extend at least how many inches through finished walls?

The requirement for the unthreaded portion of gas piping outlets to extend at least one inch through finished walls is based on safety and installation practices outlined in the National Fuel Gas Code. This specification ensures that the gas piping is securely installed and accessible for connection to appliances while minimizing the risk of damage to the gas line itself during the finishing of the wall.

A one-inch extension allows for sufficient clearance to prevent any potential interference with the wall material, ensuring that there is adequate space to make a proper connection without compromising the integrity of the gas line or the aesthetic appearance of the installation. By maintaining this minimum extension, installers can also more easily identify and service the gas outlet if needed, enhancing overall safety and functionality in gas piping systems.