Gloves & Safety Apparel. Auto & Truck Maintenance. Machining, Bearings & V-Belts. 3M FR-7800B-M FR-M40 Gas Mask, Butyl Rubber, 6 Suspension Points, M Mask Size. Gas Mask, FR-M40 Series, M, Includes Speaking Diaphragm, Facepiece Material Butyl Rubber, Head Harness Material Silicone, Respirator Connection Type Threaded, Configured For Canisters. View more great items! Other Business & Industrial. Electrical Boxes and Enclosures. Light Industrial Equipment & Tools. Electrical Outlets & Recepticles. Add to Favourite Sellers. Sign up to Newsletter. This listing is currently undergoing maintenance, we apologise for any inconvenience caused.