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Any drain in your house requires a water trap to prevent sewer gases from entering the home. Dishwashers don’t have an internal water trap, so they must use an external P trap. The most convenient P trap for the dishwasher is already in the plumbing under your sink.

The cost to pipe a sink depends on the location. Generally, you’ll spend somewhere from $150 to $500 installing plumbing under a kitchen sink and $200 to $800 installing plumbing under a bathroom sink. These costs could rise if you don’t have a plumbing hookup nearby and you have to reroute plumbing from outside of your kitchen or bathroom.

Due to the exposed plumbing, pedestal sinks are more challenging to install than traditional closed vanities. Pedestal sinks may also require additional floor and wall support or demolition. However, if you have the correct plumbing in place, then installing a pedestal sink is pretty straightforward and can be completed in a day. However, it’s best to hire a professional sink installer to ensure it’s done correctly.

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.