Conventional oxygen flow control (needle) valve and flowmeter (rotameter). Source: Anesthesia Drugs and Drug Delivery Systems, Anesthesiology, 3e Citation: Longnecker DE, Mackey SC, Newman MF, Sandberg WS, Zapol WM. Anesthesiology, 3e; 2017 Available at: http://accessanesthesiology.mhmedical.com/DownloadImage.aspx?image=/data/books/2152/longnecker3_ch35_f007.png&sec=164222793&BookID=2152&ChapterSecID=164142703&imagename= Accessed: October 24, 2017 Copyright © 2017 McGraw-Hill Education. All rights reserved