What type of solder should be used when installing a brass elbow on an LP gas line?

When installing a brass elbow on an LP gas line, it is important to use solder that is appropriate for joining fittings in gas service. A 15% silver solder is commonly recommended for this application because it has a higher melting point and greater strength than regular copper solder, which helps ensure that the joint remains secure and leak-free under the conditions present in a gas line.

Silver solder, particularly with 15% silver content, is also less likely to fail or become brittle, compared to solders that contain lead or have lower melting points. This is crucial when dealing with LP gas, as safety is a primary concern, and proper joining methods must prevent any potential leaks that could result in hazardous situations.

Therefore, the use of 15% silver solder is an industry standard for gas lines, providing reliability and ensuring compliance with safety regulations.