Step 3 · Disconnect P-Trap from Drain Body
Move to the area below the shower. Identify the P-trap connected to the bottom of the shower drain. Place your bucket underneath it. Using channel-lock pliers, grip the large compression nut (slip nut) that connects the P-trap pipe to the drain's tailpiece. Turn it counter-clockwise to loosen and remove it. Pull the P-trap down and away from the drain body. Some water will spill out into the bucket.