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there should be 2 thinwall PVC tubes that fit in the rear drain holes. These tubes keep the water from seeping between the foam. I made sure that they were at the proper height (flush) for complete drainage and then sealed around the edge with "Elmers " old fashion glue to seal the tube to the foam. With " Elmers" there is no chemical reaction or distruction to the foam. The tubes are about...1/2 '' ib X 4''
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