What is the minimum length that the unthreaded portion of gas piping outlets must extend through finished surfaces?

The minimum length that the unthreaded portion of gas piping outlets must extend through finished surfaces is essential for ensuring safety and functionality. The correct length is one inch. This requirement facilitates a proper seal to prevent gas leaks while also ensuring that connections can be made easily to appliances.

Extending only one inch allows the unthreaded portion to protrude sufficiently for connection without being excessively long, which could complicate installation or create potential hazards. The one-inch guideline maintains a balance between safety, practicality, and compliance with industry standards.