Hot water tank plug never seen one like this
We bought a new to us travel trailer with an Atwood hot water heater. Instead of the normal nylon drain plug they have a galvanized square plug on it For the life of me I can't get it off it seems ...
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The Channel locks may be the problem, try a small pipe wrench. I don't think channel locks are very efficient at transmitting torque. You may also want to soak the plug threads with some sort of thread loosening spray, pipe blaster or some such.
