Well its looks like the "if its not broke don`t fix it"Is the answer from most of the posta I read here.And I tend to agree.If you go to the dealers web site and click on "tech tips"it will show you this machine they use to pressurize.i`am sure where I have the crank open windows that their will be air threw them.can`t see how it wouldn`t.Any way their the link to the web site.Take a look at this machine.
www.parkviewrv.com