Paul,
I am simply referring to a part that has been either recommended or required for many years (at least to 2010). Why is everyone so opposed to using a tried and true device? The rules have not changed that much, using nearly identical language...
R82 “Working” air pressure on the ROBOT must be no greater than 60 psi and must be provided through a single primary adjustable, relieving, pressure regulator.
Norgren regulator P/N: R07-100-RNEA or Monnier P/N: 101-3002-1 recommended.
Not "required".