O-Ring Kit 
The ultimate in a “save-a-dive” kit. 16 different size “O” rings and it includes two picks. Packaged in a compartmentalized case with a size key to help identify which “O” ring is needed.
Sizes include O rings for Pressure Gauge swivels and hoses to Tank Neck “O” ring.
Viton and NBR “O” rings
Nitrile / NBR usage:
NBR is the standard material for hydraulics and pneumatics. NBR resists oil-based hydraulic fluids, fats, animal and vegetable oils, flame retardant liquids (HFA, HFB, HFC), grease, water, and air. Most common material in the scuba industry.
Have been used safely for some time in SCUBA diving by divers using gas blends referred to as Nitrox. Viton is used because it has a lower probability of catching fire, even with the increased percentages of oxygen found in Nitrox. It is also less susceptible to decay under increased oxygen conditions