What type of solder should be used for a copper elbow on an LP gas line?

When working with copper elbows in an LP gas line, the use of 95/5 solder is highly recommended. This type of solder consists of 95% tin and 5% antimony, which offers excellent strength and corrosion resistance. These properties are particularly important in gas applications where reliability and safety are crucial, as a strong, leak-tight solder joint is essential to prevent gas leaks and ensure the integrity of the system.

Using a solder that has higher tin content helps maintain a solid connection under the expansion and contraction that may occur due to temperature fluctuations in gas lines. Additionally, 95/5 solder's lower melting point compared to some other solders allows for easier application while maintaining the necessary strength for gas service. It's important to use a solder that is specifically designed for such applications to meet safety standards and ensure proper operation of the gas line.