I used Gorilla Tape to close similar holes on my previous Montana. The trick is to ensure the coroplast in clean before applying the tape. Seven years and 40,000 miles later it was still sealed tight. I used it on two other member's Montanas and they are going on 10 years with the tape still applied.
The Gorilla Tape will likely hold until have to change the valve again.
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Carl (n Susan)
There is more to life than fuel mileage.
2012 Montana 3700RL Big Sky Package towed by a 2015 Ford F350 6.7L PSD 4WD CC LWB
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