Step 6 · Tighten and Test for Leaks

This is the step people usually slow down on. Go finger-tight first, then a quarter turn. No rush — replay the clip whenever it helps.

Once the slip nuts are hand-tight, use the channel-lock pliers to give each nut a final quarter- to half-turn. This will snug them up and compress the washer to create a watertight seal. Do not over-tighten. Remove the wet towels and place a clean, dry towel or paper towels under the reassembled trap. Turn on the faucet, first with cold water, then hot, and let it run for at least one minute. Closely inspect both slip nut connections for any signs of dripping or moisture. If a leak is present, try tightening the corresponding nut a little bit more. If it persists, you may need to disassemble and check the washer alignment.