The Kirby Morgan 37 Diving Helmet comes standard with the Quad-Valve™ exhaust system, which has less breathing resistance than the older single valve exhaust while providing an extremely dry hat. The 455 Balanced Regulator regulator featured on the Kirby Morgan® 37 is an all stainless steel regulator with superior breathing performance. The Kirby Morgan 37 is one of the most popular designs in the world. It’s considered the standard of the commercial diving industry, as well as the U.S. Navy. Choose the Kirby Morgan 37 if you want a rugged diving helmet with a traditional design.