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Long story short- when converting my 92F150 from r12 to 134 i took out both valve cores (ya i know only the low side is suppost to be removed) and now i need the high side back in. The conversion fitings have a core built in the low side but not the high. They old cores are different- one is blue and one is black. My ? is which one is the high side service valve core
my experience with them has always been they are two different sizes, and will only fit in their proper fitting.
never seen them both the same size like that
