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I see dotted lines that are attached to pipes when I put in an isolation valve. What are they for? Can I turn them off?
The dotted lines associated with the isolation valve shows what pipe the isolation valve is attached to. It's there because isolation valves do not split pipes and if you accidently move you isolation valves around the only way you could visually tell what pipe it's associated with is by opening it the properties of the valve. In that respect the dotted line is very important.
While there is no way to get rid of the dotted line or turn it off, but if you line up the dotted line over the pipe you can hide it so you don't have to see it.