This is a new wall mounted twin gauge mixed gas primary regulator, with pressure and contents gauges, and safety blow off valves.
The regulator is preset to 40 PSI.
The gas regulators have two different types of content gauges as shown in the images above, one gauge has coloured bands and the other looks similar to the pressure gauge, but they both do the same job.
Safety Blow Off Valves
3/8″ Gas Outlet Port