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Thanks both overflows are same size. The emergency overflow needs to be cut down sticks out of overflow.Your main over flow is the smaller one of the two,where the emergency overflow is the taller one..if looking inside the overflow box the main one goes in the middle..you can email waterbox and they will send you some instructions There are some manuals on their website that may help
I plumbed it to my 150They also have some YouTube videos as well that may help... I just started looking at their tanks myself.

