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If your sink is on an exterior wall that isn’t insulated, or if pipes travel through a cabinet against an exterior wall that prevents heated air from circulating around the pipes, the pipes can freeze, causing them to burst. The best way to avoid leaking sinks is to insulate the pipes and open cabinets in the short term to warm the water line up and prevent freezing.

There are several types of sink drain stoppers, including pull-out, twist-and-pull, and pop-up. Pull-out sink stoppers can be removed by pulling on the stopper until it comes out of the drain. A twist-and-pull design requires lifting then turning the stopper to lock it in an open position and the opposite action (turning, then pressing down) to close it. A pop-up sink stopper works by pushing down the drain cover to open or close the passageway. 

Undermount sinks have clips that attach to the countertop, but they have pros and cons. They are heavier than drop-in sinks, so they only work with sturdy countertops like natural stone and are a more expensive option. You might need someone to help you install the sink, depending on its weight.

Different plumbing problems can cause your P-trap to leak. The biggest problems are loose nuts and misaligned pipes. Over time, your P-trap can leak due to the rush of water moving through the pipes, which in turn loosens the nuts and causes the pipes to fall out of alignment. Other problems include worn rubber O-rings and cracked pipes.