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This is listing is for either a single breathing tube or a box of 5. Shipping is FREE. Sentinel XL PAPR (powered air-purifying respirator) breathing tubes are compatible with Sentinel XL blowers and headgear of the same brand and series. PAPR (powered air-purifying respirator) breathing tubes direct filtered air from the blower to the headgear. Covers keep blower units clean when painting or performing other activities that create blowback that can dirty the unit.