Those are the ports that drain the cold water line( blue) and hot water line ( red). It is up to you but some people drain them after each trip. It does keep the lines fresher. If you do drain them, drain the WH first as opening the low point drains with water in the WH will draw out some of the crud that settles in the bottom of the WH. Some will stay in the lines then be pushed into the faucets next time you use water. There are several ways to add a valve to the hoses to make draining easier. I used an adapter to a 1/4 turn valve.
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