No, you didn't damage the regulator by connecting to a 100 pound tank. The pressure from either a 20, 30, 40 or 100 pound tank that flows to the regulator is the same, so the regulator simply doesn't know if it's a big or little tank. That said, all (not just Keystone) manufacturers buy the lowest bidder's products, usually made in China and of the "expected quality".... Yeah, I know, but like the tires, the steel in the bumper and the spring suspension, add the regulator to the list of "they coulda done better".....
At least you got it working and things are back to normal.
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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