Valve Outlet Cap or Plug : A removable device that forms a gastight seal on the outlet to the control valve that is provided on a source containing a compressed gas or cryogenic fluid
NFPA 1 Fire Code, National Fire Protection Association (NFPA), MA, USA 2009 ed. https://law.resource.org/pub/us/code/ibr/nfpa.1.20 03.pdf, (Code: Nat Fire Protection Association Fr&LfSf Requir - Amer) {171 NFC}
NFPA 55 Standard for the Storage, Use, and Handling of Compressed Gases and Cryogenic Fluids in Portable and Stationary Containers, Cylinders, and Tanks, 2005 ed. http://www.nfpa.org/assets/files/AboutTheCodes/55/ TIA55-05-1.pdf, http://www.colorado.edu/firelifesafety/sites/defau lt/files/attached-files/gas_storage.pdf, (Std: Storage, Use, and Hndlg of Compressed Gas and Cryogenic Fluids in Portable and Stnry Conts, Cylinders, and Tnk - Amer) {211 NFC}