Quick Connectors® B Fitting Half, Oxygen, Male Plug ORS NASCO Cartridges come with a new Cartridges come with a new inhalation valve for less maintenance and fewer parts to inventory Conforms to the contours of your face without pressure points Extra wide flange seals easily and stays sealed even when talking Low profile provides a wider field of vision than any other respirator Soft yet durable facepiece designed for comfort and D3 rating chemical splash IRUV filter additives in shade 3 and 5 provide additional infrared and ultraviolet radiation protection Ideal in heavy manufacturing Click in and click out design eliminates time consuming hand threading and ensures pressure tight connections Color coded for fast and safe handling Built in check valves prevent the reverse flow of gases