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Message: <blockquote data-quote="Hanr3" data-source="post: 83196" data-attributes="member: 1055">Thanks and your welcome.I also suspect you could be right about the drain. I did whack another 1" off the top to gibe me more time before it overflows. It could also be that the overflow drain is 3/4", too small. I can still and might put in an overflow drain at the top, put in a tee and connect it to the main drain. Then I just need a plug for the lower drain. That will be easy enough to make, whack off the tube close to the bottom and put a pvc cap on it.Tunnels, great idea to add extra floatation. I might have to use that idea.</blockquote>