1. Adaptors:
2. Couplings:
3. Elbows:
4. Tees:
5. Crosses: These fittings are used to join four pipes or have a four-way connection.
6. Caps and Plugs:
7. Unions:

1. Copper:
2. Brass or Bronze:
3. Steel:
4. Plastic: Lightweight, inexpensive, and non-corrosive.

The NFPA has published several codes and standards relating to gas piping. The most notable is NFPA 54, which covers the installation, maintenance, and use of gas piping systems for heating and cooling applications.

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