Nitrous plumbing A1A...??..

https://www.cjponyparts.com/zex-4an-liquid-filled-gauge-kit/p/82341/

The Zex 82341 has a -4an Female in and a -4an male outlet that will screw onto most bottle nut adapters.

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Nice find!! Pictures of all angles sure tell's the story... And saved a call (and possibly a half hour on the phone) to zex..
Thank you!.…