[1991 Corvette ZR-1]

Originally Posted by Jagdpanzer

Dorman has a brass cap for this purpose.
https://www.dormanproducts.com/p-80262-902-025.aspx


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Thank you for this. I ordered it and should have same day as the schrader valve removal / installation tools. I will coat the threads with some type of sealant, thread it in the R134a adapter and do another vacuum check once I have it.