You could cut a U shaped flap in the coroplast with the rounded part facing forward and inspect to see if it is wet under there after inspection close the flap using foil tape.
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Retired Navy
Jake my sidekick (yellow Lab) 10/04 - 05/20
2017 RAM 2500 CC 4X4 Cummins Diesel
2016 Flagstaff 26 FKWS
AF&AM & El Korah Shrine of Idaho
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