When you replace the gasket be sure to replace or install the screen over the vent pipe to keep bugs out of the system. I prefer the gasket over caulking as some of the gaps between the pipe and roof cutout are sometimes large, and you have a good seal. I replace my gaskets about every 5 years. Easy to do when resealing the vents stc on the roof
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ACI #7394
2012 GMC 2500 HD Duramax Denali
1994 Excella 34'
1987 Limited 34', 1976 31', 1976 Argosy 22' Gone to new homes
Hensley Hitch
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