No longer in production. Spares are available.

Stainless steel REX regulator
Features the all stainless steel REX regulator, as well as a stainless sideblock, helmet ring, handle, and other key components.
The REX® Exhaust System is standard on this helmet. The advanced regulator pod on this helmet allows it to be outfitted with other Kirby Morgan regulators, including the SuperFlow® 350 or the all stainless steel 455 balanced regulator.
The advantages of this stainless steel helmet include the following:
– Rugged helmet shell and other components
– No refinishing required if the surface is scratched or gouged
– Elimination of threaded inserts for securing port retainer to helmet shell
Part Numbers
500-090 KM 77 Helmet w/Posts
500-091 KM 77 Helmet w/MWPC