Location and Description of Major Components

TM 5-4220-226-14&P 1-6. Equipment Characterlstlcs, Capabilities, and Features - continued. b. Capabilities and Features. (1) Capable of operating from both a main breathing air supply or an emergency supply. (2) Capable of communicating with surface personnel. (3) Woven fiberglass and polyester resin construction resists cracks and will not carry an electrical charge. (4) Offers complete head protection (head, ears, and face remain dry). 1-7. Location and Description of Major Components. 1 Handle Convenience for carrying and handling the helmet. Can also be used to mount lights or tape weights or other items to helmet. 2 Face Port Provides field of vision for diver. 3 Main Exhaust Provides automatic water purging for any flooding. 4 Neck Dam System Secures the helmet from accidental removal by firmly locking helmet around diver's neck. 5 Communications Whip Waterproof four-pin connector for sending and receiving communications signals. 6 Demand Regulator Supplies breathing air to diver on demand and shuts off during the exhalation portion of breathing cycle. 7 Side Block Assembly Manifold that receives breathing air from the main or emergency supply, then directs air flow to the demand regulator. 8 Nose Clearing Device Allows diver to block his (her) nose to provide an overpressure in the sinus and inner ear for equalization. 1-2