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Most sinks in a house will only require a 1.5″ drain when installing new piping. However the drain size for a laundry sink needs to be 2″ in diameter. A laundry sink is sometimes referred to as a utility sink is often located in the same room as the washer and dryer.
A laundry sink needs to be 2″ instead of 1.5″. A kitchen sink needs to be 2″ which makes sense because people put some much wasted food down the kitchen sink. The kitchen sink is also the first line in a house to give you problems with backing up. If you are adding a new sink you should make sure that your drain is properly vented.
If you are plumbing a laundry area there are a few things that you should consider. A washer will have a quick closing valve which can cause water hammer. In order to prevent water hammer a water hammer arrestor should be used.