Which of the following describes the pipe joints available for polyurethane?

• A. Butt joint, Lap Joint, Dado
• B. Butt type, Shiplap, Tongue & Groove
• C. Mitered, Corner, Bead
• D. Welded seam, Seamless, Flanged

Answer: (B)

The idea being tested is which joint styles are used to connect polyurethane pipe sections. The best answer lists butt type, shiplap, and tongue & groove as the joint options. A butt type joint brings the ends together in a flat, simple join, often sealed to prevent leaks. Shiplap provides an overlapping edge that interlocks to reduce gaps and give a stronger seam, especially useful for flatter pipe segments or insulation panels. Tongue & groove creates an interlocking fit where a protruding tongue on one piece slides into a matching groove on the other, helping with precise alignment and distributing stresses across the joint.

The other options describe joints more typical in woodworking or metal piping contexts (such as dado grooves, mitered or corner joints, bevels, welded seams, seamless construction, or flanges), which aren’t the standard ways polyurethane piping is joined.