That's because the seal is made with the oring towards the front of that fitting. The threaded collar is just to secure it into whatever orifice is on the mating surface. There is no adapter on earth that will do what you need.
If you have a Home Depot or Lowe's nearby, they carry a very limited number of John Guest fittings in the store and you can get it faster:
https://www.homedepot.com/p/John-Gu...-Polypropylene-Valve-Fitting-803389/300753484
Bingo! I think you're on your way to a good solution, glad I could help get the ball rolling.
The other nice thing about this solution is that your faucet is still functional when the steam slayer is running ...Worked like a charm! Didn’t see a 12-inch hose in the store so got a 20-inch. Thanks again for your help, everyone!
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