Professional diving helmet 29134N

This is the early model standard U.S. Navy Helium/Oxygen Mixed Gas Diving Helmet based on the standard Mark V Diving Helmet. The main feature of this diving helmet is the canister mounted on the rear of the helmet and a venturi system allowing for recirculation of breathing gas to conserve Helium. The canister was filled with a scrubbing agent to remove Carbon Dioxide from the breathing mix. The breastplate is the same as a normal Mark V except the lock assembly is relocated to the front. All other parts are the same as a standard Mark V except for the omission of the spitcock valve, some additional ducting, and a extra communications elbow which the Navy used to connect electrically heated underwear to a power source. The canister can be removed and with the canister elbows capped the helmet can function as a normal Mark V. Original single exhaust Helium helmets did not have a lifting eye. We offer the lifting eye as an option on both styles of USN Helium Helmets. Standard finish is Tin plate but the helmet is also available polished($250.00 additional for polished helmet). Shipping weight with canister approximately 93 lbs. The U.S. Navy Mark V Helium Helmet is available in two versions. DESCO can produce either style of this helmet for you. The Early Single Exhaust Valve Version: The early version has the standard Mark V exhaust valve with a exhaust tube extending to the back of the helmet. The Later Double Exhaust Valve Version: It was found that seawater could leak back into the helmet through the single exhaust valve.