1st Stage Features include:

Balanced diaphragm design and the environmentally sealed ambient chamber ensure top performance in any condition.
Redesigned environmental seal cap and yoke knob enhance ergonomics & design aesthetics.
Percision machined neoflon seat harder more reliable material, keeping you diving longer.
First Stage Materials:

Body:

Brass

O-rings:

Nitrile

Seat:

Neoflon (PCTFE)

HP Valve:

Stainless Steel

2nd Stage features include:

New inhalation diaphragm provides superior tear strength and improved response time to breathing (super soft silicone molded over a low friction disk).
Improved exhaust valve ensures dryness and a lower exhalation effort.
Seat-saving orifice, compliments of Atomic Aquatics, retracts when not in use – extending the life of the breathing tube seat. (#5,803,073)
Seat comprised of soft silicone molded over a metal insert to deliver the firmness required for an airtight seal while maintaining the necessary elasticity to prevent leaking.
Redesigned front cover and inhalation effort control knob use co-molded components that provide the necessary grip, soft touch and ease of use. Available in several color kits
Zirconium-plated inlet tube and heat sink for superior corrosion resistance.
Redesigned heat sink dramatically increases surface area, aiding in the heat exchange necessary to avoid freeze-up.
Co-molded silicone mouthpiece for better fit and less jaw fatigue
Second Stage Materials:

Cover:

TPU

Case:

Nylon 12

Poppet Seat:

316 SS insert with silicone overmold

O-rings:

Nitrile

Diaphragm:

Elastomeric Polymer

Exhaust Valve:

Silicone