McMaster 9194N113 Chemical Resistant Viton Fluoroelastomer O Ring, High Pressure, 1 16 Width, Dash No. 012, ID 3 8" × OD 1 2", Pack of 5 J6177F Its corrosion protected design extends the Its corrosion protected design extends the durability of the component in harsh working conditions Watertight Includes Foam Yes Number of Wheels 2 Water and Air Tight O Ring Polymer Handle Style Over Molded Handle Standards MIL STD 810G Item Protective Case Water Tight Up To 1m for 30 min Case Type Carrying Case Construction Copolymer Polypropylene Mfr 504" Hardness Durometer 95A (Hard) Maximum Pressure 2 They're often used in compressed air systems or oilfield equipment