Holmesaw, I have the same problem and have even looked at using a larger pass through but to no avail they don't make anything that will fit that small flat any larger. I did see a guy while camping in Maine that enlarged the hole and found a rubber plug that has a back plate so as to tighten it up but it looked like a half-a#s fix and took him just as long to place it in the hole right as it did me to remove the fitting.
Have you tried the prest-o-fit hoses? They look like they will fit through the hole but I don't know if I would trust them unless they lock some way.
Earl
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