When installing gas piping, what is the allowed length of a flexible connector?

The correct choice reflects the standard practice for gas piping installations involving flexible connectors, which are generally allowed to have a length of up to 3 feet. This limitation is in place to ensure safety and maintain the integrity of the gas piping system. Flexible connectors are designed for short runs and are usually used to accommodate movement or vibration, making them effective in these limited lengths. Using a length beyond this standard can increase the risk of leaks or failure due to the potential for excessive bending, stress, or wear over time. Uniformity in the maximum allowed length helps ensure that all installations follow safe practices as outlined in the relevant codes and regulations, contributing to overall safety in gas installations.