OE high valve uses the "body" as part of the seal for popup part.
Even w/ R12, The Al Body likes to wear or "rust" and won't seal.
W/ R12, Many use a hard cap to cover the service valves for this and other problems.
But R134 have no cap/cover that does anything besides maybe keeping crap off the valve.
Is or Was a High Side adapter w/ a schraders valve to fit these but no clue where to get.
It was made so can leave old iffy valve so didn't empty a system. New valve bottom pushes old valve when needed.
I bought mine 20+ years ago from local parts store.
Maybe hard to find now because many R12 parts has little or no market now.
Can hard cap the old valve and fitting and use a R134 "Stinger" next to it.
In short, This you drill a small hole in the tube then clamp on the valve.
Many "kits" will piece the tube itself and why called Stingers. Many don't trust self sting for anything because valve can have problems later. Big example is Stingers for Ice makers etc for home that won't work but can happen in many other cases.
try
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(Jurassic Park)
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