Vent Whistle A type of audible overfill prevention device used with aboveground tanks that produces a high pitched whistling sound continuously during the fuel delivery and stops when the alarm level is reached. See also PEI/RP600. By rhys|2014-10-23T14:55:18+00:00October 23rd, 2014|Comments Off on Vent Whistle Share This Story, Choose Your Platform! FacebookTwitterRedditLinkedInWhatsAppTumblrPinterestVkXingEmail About the Author: rhys