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The regulations around whether drain pipe installers need to hold licenses or certifications differ based on where you live and the type of drain pipe installed. Municipalities have varying rules and regulations about who can and can’t perform plumbing work. However, we recommend hiring a certified plumber to install or modify your drain lines. Licensed plumbers will perform a high-quality, professional installation, which translates to a lower risk of clogs and leaks in the future. Use Angi’s state licensing tool to confirm the license status of your potential plumber before hiring them to install your drain pipe.

The size of the pipe you use for your shower depends on the part of the shower you’re installing. Shower drainpipes have a 2-inch diameter, and the water supply lines (both hot and cold) have a ½-inch diameter. You may want to slightly increase the size of the vertical pipe if you have dual showerheads. Check the local building code prior to installation for guidance.

A plumber or certified gas technician is responsible for capping gas lines. Gas lines require expertise and understanding of safety standards to ensure it’s properly sealed. Your local regulations may also have specific requirements for capping gas lines.

Yes, you can fit a vanity unit to an existing sink, especially if you plan to custom-build the vanity. With a prefabricated vanity, you’ll likely need to make a few adjustments. It depends on the type of sink, the size of the sink, and the existing plumbing. If you plan to retrofit a sink into a prefabricated vanity, make sure you take precise measurements and that your sink is compatible with the vanity you select. Prefabricated units have a precut sink hole, so you’ll need the size to match your sink.