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Yes, there are different size sink drains, but a 1 ½-inch-diameter drain is the most common modern drain size. However, some sink drains are 2 inches or 3 inches in diameter. A bathroom sink drain is 1 ¼ inches in diameter, and kitchen sink drainpipes are 1 ½ inches in diameter.

Yes, a toilet, sink, and shower can share the same vent. This is a common plumbing practice that can simplify installation and save space. When sharing a vent, it's important that the toilet is located downstream from all other fixtures. You will also need to ensure the vent pipe is large enough to handle the demands of all connected fixtures without compromising its effectiveness. Because requirements can vary, you should always check your local building and plumbing codes. Consulting a qualified plumber is recommended to ensure the vent is properly sized, installed, and adheres to all local regulations.

Silicone caulk—despite having some adhesive properties—is not the primary thing that holds your sink in place. Rather, it seals the gaps around the sink to prevent water from leaking and causing issues with mold and corrosion. Most sinks are secured by clips, though some sinks are secured with two-part epoxy or brackets.

Older faucet fixtures may have some corrosion, leaving them stuck. Try a few techniques to loosen the fixtures.

• Wrap the fixture with a towel and tap the base with a hammer.

• Use a putty knife to gently remove any caulk that may be holding the handle or fixture in place.

• Apply a few drops of penetrating oil around the base of the fixture or around the nuts.

• Purchase a faucet pulling tool to pop the fixture loose.