[Rhodes22-list] Water tank

[Theodore Boender]

All,

last week when I pulled my boat out of the water I emptied the water tank by running it completely empty.  Now today when I'm getting the boat ready for winter I look at the water tank and it looks like this, see picture. It appears as if there was a vacuum in the line and sucked all the water out of the tank and the air and collapsed the water tank. What did I do wrong?

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Cheers,
Ted