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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.

The best place for a kitchen sink drain is the middle of the sink. Most people prefer center drains because they allow for better water and waste drainage, and the center location limits splashing because water flows straight down the drain hole. If the sink drain is too close to the edge of the sink, water can collect and drain too slowly. It can also be easier to clean sinks when the drain is closer to the center since debris is easier to wash down and doesn’t collect along the sides as easily.

No, you don’t need to use plumber’s putty to install a sink drain. Other options are available, such as silicone putty or silicone caulk. Plumber’s putty is the traditional method and it’s easier to work with and easier to remove. It doesn’t need to dry before using. Silicone putty should dry before you use the drain.

When installing an undermount kitchen sink in a granite countertop, use 100% silicone to secure the basin. If you’re worried your sink is too heavy, speak with a countertop professional about how to adhere the sink to the countertop without worrying about issues down the road. Sagging undermount sinks can be a common plumbing problem if they’re not properly adhered, so always make sure you’re using a high-quality material.