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Final Assembly and Adjustments — Dry-Fit the New Assembly

Beginner

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How to Replace a Bathtub Waste and Overflow Drain Assembly · Step 6 of 9

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Complete the installation by installing the drain stopper and overflow control. The pop-up drain stopper simply drops into the drain flange. Its height can be adjusted by turning the threaded post on its underside to ensure it sits flush when closed and allows water to drain when open. The overflow control knob, which operates the cable, is attached to the overflow cover. Test the mechanism by turning the knob to ensure the drain stopper opens and closes correctly. Finally, check the underside of the tub to ensure the gaskets have not been squeezed out of place from over-tightening. It is critical to test the installation for leaks before closing up access.

Goal: Install drain stopper and test for leaks

  • Adjust the pop-up drain stopper height so it creates a good seal when closed but allows for maximum water flow when open.
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FAQs

How long should I expect this bathtub drain replacement project to take, especially if I'm a beginner?

For a beginner, plan to dedicate 3-5 hours for this project, including preparation and clean-up. Accessing the old drain and ensuring proper sealing of the new one can take time, so don't rush the process to avoid potential leaks later on.

What are the most common mistakes beginners make that lead to leaks after installing a new bathtub waste and overflow?

The primary cause of leaks is inadequate sealing. Ensure you apply a generous amount of plumber's putty (like Oatey 14 oz. Plumber's Putty) under the drain flange and correctly position and tighten the overflow gasket. Always perform a thorough leak test before re-enclosing any access panels.

Do I need special tools to remove a stuck or corroded old drain flange, or will standard tools suffice?

While a screwdriver and tongue-and-groove pliers (Channellock 430/440) are often sufficient, a severely corroded flange might require a specialized drain wrench or carefully using a hacksaw (Husky 10 in. Close Quarters Hacksaw) to cut the crossbars. Avoid excessive force to prevent damaging the tub's finish.

What are the most important safety precautions I should take during this bathtub drain replacement?

Always turn off the water supply to the bathtub before starting to prevent accidental flooding. Wear safety glasses to protect your eyes from debris, and ensure good ventilation if using plumber's putty or sealants. A drop cloth (TRIMACO Stay Put Canvas Plus) will protect your bathroom floor and catch any spills.