CFR > Title 21 - Food and Drugs > CHAPTER I—FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES > SUBCHAPTER H—MEDICAL DEVICES (parts 800 to 898) > PART 868—ANESTHESIOLOGY DEVICES > SUBPART F—Therapeutic Devices (§868.5090 to §868.5995) > 868.5870—Nonrebreathing valve.