Massachusetts Plumbers Journeyman Practice Exam

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Where can slip joints be used in a plumbing system?

  1. Outlet of the trap only

  2. In vertical pipes only

  3. In horizontal pipes only

  4. Inlet ("house-side") of the trap only

The correct answer is: Inlet ("house-side") of the trap only

Slip joints are commonly used on the inlet or "house-side" of the trap in a plumbing system. This is where the connection is made between the trap and the horizontal or vertical pipe leading to the drain system. Slip joints provide a convenient way to assemble and disassemble this connection for maintenance or repair purposes. While slip joints can also be utilized in other parts of a plumbing system, such as in other sections of the piping, their primary and most common usage is at the inlet of the trap.