ALLEGRO - HIGH PRESSURE HEATER W/ BELT - 4000-20

This valve adjusts the amount of air to the helmet and adjusts air 25 degrees warmer than the Breathing Air for use in cold environments.
Effective, low-cost solution
No moving parts
Heats compressed air by 25° F (-3.8° C)
Lightweight
Made from durable plastic
Quick-connect (Rectus style) fitting