I think they started leaking at different times, it depends on which valve. From what I recall, the main valve for the water tank would leak when there was water in the tank; the low point valves would leak after there was water being used in the TM. I remember twice when we went camping one of the rear valves started leaking, a steady drip, drip, drip. After we changed the anode rod in the hot water heater, even one of the brass valves developed a leak. We keep our TM covered, so if they're leaking now, I wouldn't be able to tell unless I ran some water and then lifted up to cover to observe the drains. We've been down to 27.7 so far this winter, so it wouldn't be a bad idea for me to check on them!
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'97 2720 & '01 Chevy Silverado 1500 4x4
2011 & 2017 Prii, 10'x18' & 10'x9' Tents
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