How are appliance connections to gas supply lines required to be made?

Appliance connections to gas supply lines must be made using listed and appropriate fittings to ensure safety and compliance with industry standards. This requirement is in place because using qualified fittings ensures that the connections are capable of handling the pressures and temperatures associated with gas transmission. Listed fittings have been tested and certified for use with gas appliances, reducing the risk of leaks or failures that could lead to hazardous situations.

Using duct tape, any available connector, or limiting connections to only metal fittings would not meet the safety requirements established by the National Fuel Gas Code. Duct tape is not a suitable method for creating secure, long-lasting gas connections, while unlisted connectors may not have the necessary safety and reliability ratings. Although metal fittings are often used, the essential aspect is that all fittings must be specifically listed as appropriate for gas applications, thereby providing the necessary assurance of functionality and safety.