I used plastic tubing from a company roscoe for my cpap machine.The tubing attaches to the machine, which attaches to my mask and i breathe through it throughout the night.After breathing through the new roscoe tube, i awoke unable to breathe, sore throat, closed up throat, sinus distress, heavy chest.I changed back to my original tubing the next night and had no trouble, started to improve.Product description: connector on both ends.Dark gray.Retailer: (b)(6).Purchase date: (b)(6) 2018.Document number: (b)(4).
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