Essentials of Plumbing Lesson

INSTALLING P-TRAPS

A lavatory/sink waste connection from the tailpiece to the rough-in plumbing drain outlet is made by using a P-trap. The P-trap is formed using the following parts: U-shaped trap, drainpipe with one curved end, and three slip nuts and washers. P-traps come in two types and sizes: fixed or swiveled and 1¼ inches or 1½ inches.

Installing a P-trap. Use the following steps to connect the lavatory/sink P-trap (see Figure 11):

FIGURE 11. INSTALLING A P-TRAP

Slide escutcheon, slip nut, and rubber washer over the straight end of the drainpipe.
Slide straight end of drainpipe into rough-in plumbing.
Fasten slip nut hand-tight onto rough-in plumbing.
Slide slip nuts and then rubber washers over curved end of drainpipe and tailpiece.
Slide trap's lowest end onto drainpipe and highest end onto tailpiece.
Fasten slip nuts hand-tight onto trap.
Line up the connections, and tighten all slip nuts.
Slide escutcheon against the wall.