Mechanically formed tee fittings shall be _______?

Mechanically formed tee fittings are designed specifically for certain types of connections and must be brazed to ensure a secure and leak-proof fit. Brazing involves melting a filler metal, which has a lower melting point than that of the workpieces, to bond the materials without melting them entirely. This method is advantageous for mechanically formed fittings, as it provides strong joints that can withstand the pressure and temperature variations often encountered in plumbing systems.

When applied to mechanically formed fittings, brazing creates a durable connection that preserves the integrity of the materials involved, ensuring long-lasting performance. The brazing process is particularly favorable in applications where welded joints might introduce stress or where screwing might not provide a sufficiently tight seal. This is why brazing is the correct choice for mechanically formed tee fittings in plumbing installations.