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August 12, 2020 14:07:58
https://sabertacticalinc.com/pages/contact-us
that is where i would ask your question
August 12, 2020 18:17:32
@marflow, I believe the white one goes on the bottom of the brass threads. In the hole of the connection and the brass threads bottom tight into it. I don't know the name of it, but I know without it , you'll have a high pressure leak. You'll find these on the bottom of air gauges also