Bulk-pack jar of 50 units of #49010OX, used for hose swivel internal seal; regulator HP seal; 2nd stage orifice. Brown Viton (Fluorocarbon) for pure oxygen service to 2,500 psi. The clear, screw top, plastic jars are reusable for general parts storage or O-ring refills. O-ring refill #49010OX.