OMS 230 Piece O-Ring Kit A16915910 The ultimate in a ?Save-A-Dive Kit?!! A total of 230 ?O? Rings in 16 different sizes of with two Extraction Picks included, neatly packaged in a Compartmentalized Polymer Case with a Size Guide to help identify which size ?O? Ring is needed. Sizes include O rings for Pressure Gauge Swivels, Hoses, Cylinder Valves etc. Viton and Nitrile NBR ?O? rings are included. NBR is the standard Nitrile material used for hydraulics and pneumatics and is the most common O-Ring material in the Diving Industry. Viton O-rings have been used for many years with equipment used by Technical Divers using Gas Blends referred to as Nitrox. Viton is used because it has a lower probability of catching fire, despite the increased percentage of Oxygen found in Nitrox. It is also less susceptible to decay under increased oxygen conditions. Kit contains: - 20 Each AS-013 NBR90 (1.78 x 10.82), AS-014 NBR90 (1.78 x 12.42), AS-112 NBR90 (2.62 x 12.37). 15 Each 2 x 1 NBR70 (2.00 x 1.00), S5 Viton 70 (1.50 x 4.50), AS-003 NBR90 (1.52 x 1.42), AS-006 NBR90 (1.78 x 2.90), AS-008 NBR90 (1.78 x 4.47), AS-010 NBR70 (1.78 x 6.07), AS-011 NBR70 (1.78 x 7.65), AS-012 NBR70 (1.78 x 9.25), AS-015 NBR70 (1.78 x 14.00). 10 Each AS-022 NBR70 (1.78 x 25.12), AS-117 Viton 60 (2.62 x 20.30), AS-214 NBR90 (3.53 x 25.00) & 5 AS-122 NBR70 (2.62 x 28.24) O-Rings.