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Install P-Trap and Connect to Wall — Connect Drain to Waste Line

Intermediate24 hours

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How to Install a New Bathtub and Drain Assembly · Step 7 of 9

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Assemble the P-trap and connect it to the bottom of the T-fitting. To connect the P-trap to the PVC drain stub-out in the wall, glue a threaded adapter onto the stub-out using PVC pipe cement. Apply the cement to both the outside of the pipe and the inside of the adapter, then push and twist them together for a strong bond. Once the adapter is set, connect the P-trap using the final slip nut and washer.

Goal: Complete the Drain System

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FAQs

The tool list includes some unusual items. What are the truly essential tools I'll need for this bathtub installation, focusing on the specialized tasks?

Beyond basic hand tools like a tape measure and screwdriver, you'll definitely need a reciprocating saw for demolition, a level, pipe wrenches or channel locks for plumbing, a caulk gun, and a drill for securing the tub. Ignore items like bistro sets or candles from the provided list; they are not needed for this project.

This project involves demolition and plumbing. What are the most crucial safety precautions I should take throughout the process?

Always wear appropriate personal protective equipment, including eye protection, work gloves, and a dust mask, especially during demolition. Ensure the water supply is completely shut off before disconnecting any plumbing to prevent flooding. When lifting the new tub, use proper lifting techniques or get assistance to prevent back injuries.

The project is rated 'intermediate' with an estimated 24 hours. What aspects make it challenging for a DIYer, and is the time estimate realistic?

The intermediate difficulty stems from the precision required for plumbing connections, ensuring the tub is perfectly level, and potential subfloor or stud repairs. The 24-hour estimate is for active working time, not calendar days; expect to spread this project over several days or a long weekend to account for drying times and unexpected issues.

What are the most common mistakes DIYers make with the drain and overflow assembly that lead to leaks, and how can I prevent them?

The most common mistake is improper sealing. Ensure you use plumber's putty or silicone caulk correctly around the drain shoe and overflow gasket, making sure all connections are tight but not overtightened. Always perform the leak test step thoroughly before enclosing any plumbing, as undetected leaks can cause significant water damage.

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p-trap and as you can see I've this is all rough fitted it's not installed yet. So that's roughly what the p-trap will do and it's going to have to connect to the stub out on the wall. This is an adapter kit that I purchased that will go from the one and a half inch PVC pipe and step down and connect to the one and a half inch polypropylene. One and a half inches is the minimum size a kitchen sink can be according to code. Since they're both different materials they're both different sizes so that adapter will make a proper fitting connection. I cut the PVC and things are fitting together nice so I'm going to glue the adapter on and I do that with PVC glue. You just put a little bit on each fitting the pipe and the fitting and press it in together and twist as you turn so it gets seated nice and tight and snugged up all the way. So as you can see we're almost done with this setup here. What's missing is the

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