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Yes, you can use flexible pipe for a sink drain. Flexible pipes can make it easier to fit sink plumbing together with less measuring and fewer cuts. However, corrugated flexible pipe can trap hair, grease, and food particles in the folds and cause foul odors and eventually build up enough to clog the drain. Smooth pipes are recommended for sink drains and plumbing.

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.

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.

If you find moisture under your sink, you can clean up the worst of it with paper towels or regular towels. Then, leave the cabinet doors open to allow air circulation. You can also place a fan or dehumidifier near the cabinet to help dry it out a little quicker.