Inflatable Adapter

I decided to make my own adapter so I could fill my stand up paddle board from a compressor. While at it, I decided to make a version that included a gauge.

My SUP has a Bravo brand valve but this is likely to work on recent vintage Halkey-Roberts vales as well.

In addition to what you print, you'll need some or all of these:
1) https://www.amazon.com/gp/product/B006K2RG2W/ref=oh_aui_detailpage_o03_s00?ie=UTF8&psc=1
2) https://www.amazon.com/gp/product/B001PLI4BA/ref=oh_aui_detailpage_o04_s00?ie=UTF8&psc=1
3) A rubber gasket

I found the black gaskets pictured at my local hardware store in the plumbing section. They were labeled "3/4 inch". Big help right? This is the inside diameter. These may be available in a watersports shop as replacements.
I included an stl file for a possible gasket if you have some flex filament. I had some semi-flex around but wasn't pleased with the result. May try NinjaFlex when I get some. The Gasket is untested.

[Update]
Got a small roll o