I do not think I have seen Mr. Lee's folding mechanism for the PROD yet
I’m not sure if the that gauge block off would work or not with the Prod valve. Threads should be the same, may need to use a different poppet spring, but I’m unsure of the length would be enough to block off the gauge port? I like the mag air stuff, a little pricey. The fill adapter would be cool to turn into a reverse bottle mount for the Prod/1720t