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Is it copper? Then it is water.
Is it cast iron? Then it is gas.
If it is plastic, what color is it? Blue, cold water. Red, hot water. Yellow, gas. Orange, not for you to play with. Clear, white, grey? Fuck that guy who did that.
Some older houses in my area have copper gas lines.
East Coast?
Yea east coast. It's not code anymore, now you have to use black iron.
What's orange?
Radiant heating.
Danger
Not cast iron, it's rolled steel but the trade name is black iron pipe. Cast iron is used only in drainage.
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