Which types of fittings are allowed to be installed in concealed locations?

The correct answer is that all types of fittings listed can be installed in concealed locations. This includes threaded elbows, tees, and couplings, as well as brazed and welded fittings.

When considering installations in concealed spaces, it’s important to recognize that the integrity and reliability of fittings are crucial for safety. Threaded fittings, such as elbows and tees, are designed to create a secure and leak-tight connection when properly installed. Similarly, brazed and welded fittings provide robust connections that are resistant to both thermal expansion and external pressures, which is particularly important in concealed applications where access for repairs could be limited.

In practice, these fittings must adhere to specific codes and standards to ensure that they are suitable for the environment into which they are installed. The use of high-quality materials and techniques is essential, regardless of whether the fittings are concealed or exposed.

Overall, knowing that all types of fittings can be used in concealed applications offers flexibility in installation design, while still emphasizing the need for compliance with safety standards and best practices.