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While the drain connection for a garbage disposal is nearly universal and fits standard sink drain holes of 3 1/2 to 4 inches, the size of the disposal unit itself is not. You must have enough space in the cabinet underneath your sink to accommodate the disposal's housing. A larger model may not fit in a compact cabinet or if the existing plumbing is arranged in an unusual way. Before buying a new garbage disposal, measure the available space under your sink. If you are replacing an old unit, it's often easiest to choose a new model of a similar size.

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.

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.

Clean regularly with non-abrasive cleaners, avoid pouring grease down the drain, and check for leaks under the sink.