Genesis "GS2000" Regulator GR450:
Nitrox Compatible Up to 40% Oxygen Out-of-the-Box
3/8" Threaded 31" (78.75cm) Low Pressure Hose
Owner's Manual
First Stage:  Genesis Dry Air Demand (DAD)
Mechanically Balanced Flow-By Piston
Flow-By Piston: "Fail Safe" Mechanism
Excellent Breathing Characteristics at Full or Low Cylinder Pressures
Marine Grade Chrome Plated Brass for Long Life and Durability
Dry Air Demand (DAD) Design:  
Keeps Intricate Components Clean and Contaminate Free 
No Messy Oils or Grease as with More Sophisticated Designs 
Environmentally Sealed w/o the Mess! 
Seals-Out Sand, Silt, Salt and Chlorine Contaminates 
Less Maintenance
Two 7/16" Threaded High Pressure (HP) Ports
Four 3/8" Threaded Low Pressure (LP) Ports
High Capacity Inlet Filter for Smooth Delivery of Air to Second Stage
Second-Stage:  Genesis GS2000 Balance 2nd Stage
Delivers Air Effortlessly
Venturi Pre-Dive/Dive Switch: 
Eliminates Sensitivity 
Great for Swimming Thru-Surf, Jumping-Off Back of Boat, or Fining in Current 
Allows High Performance Breathing when Needed
Non-Corrosive ABS/Polycarbonate Housing
Corrosion Resistant Passivated (302) Stainless Steel Demand Valve Lever
Breathing Resistance Adjustment Knob: 
Adjustable for Optimal Resistance 
Once Adjusted, 2'nd Stage Automatically Compensates for Changes in Ambient Pressure 
Smooth and Easy Breathing from Start to Finish of Dive
Orthodontic Mouthpiece: Reduced Jaw Fatigue