I have a spare 34098-VUG which comes with the 18103 fitting. That fitting has a Schrader valve in it and I wasn't sure if that would work with the GM switch. They make that so you can swap bi/tri switches without having to empty the system first. I agree that the #8 would be best but VA is only making #6 line t and ports. - hence the need for the 34098 fitting. If I can piggy back the two switch fittings, that would be awesome. I am using the aluminum drier and that has no ports on it.
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