Valve, Indicating : A valve that has components that show if the valve is open or closed. Examples are outside screw and yoke (OS&Y) gate valves and underground gate valves with indicator posts
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 24 Standard for the Installation of Private Fire Service Mains and Their Appurtenances, 2007 ed. http://pleasantprairieonline.com/services/fireandr escue/documents/24-13A-PDF.pdf, (Std: Instll of Prvt Fr Srvc Mains and Their Appurtenances - Amer) {190 NFC}