DIY Network

How to Install a P-Trap

When renovating a bathroom and replacing a shower floor, it's a good idea to replace the P-trap. Use these step-by-step instructions and install one in no time.

More in Plumbing

  • Time

    Under Half Day

  • Price Range

    $100 - $250

  • Difficulty



Step 1: Cut the Shower Floor

When you are replacing a shower floor, it's a good idea to replace the P-trap while it is accessible.

Cut open the shower floor, giving yourself enough room to work around the drain.

replace P trap while it is accessible

Step 2: Measure and Cut the Plywood

Draw lines on the area you want to cut (Image 1), then make a plunge cut with a circular saw (Image 2). Cut along all four lines, then use a reciprocating saw to cut the piece in two (Image 3). Pry up the pieces (Image 4).

Step 3: Position the P-Trap

Use a reducer to transition from the existing 1.5" drain line to the 2" drain. Apply ABS glue to the pieces and press them firmly together (Image 1). Be sure to place the P-trap in the correct location for the drain (Image 2).

Step 4: Install New Plywood

Drop a new piece of plywood into place so you can measure the distance from the drain to the P-trap. Cut a piece of ABS to connect them.

Screw plywood to floor joists, then attach the drain.

drop new piece of plywood into place

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