[Code of Federal Regulations] [Title 46, Volume 4] [Revised as of October 1, 2006] From the U.S. Government Printing Office via GPO Access [CITE: 46CFR131.820] [Page 462] TITLE 46_SHIPPING (This book contains parts 90 to 139) CHAPTER I--COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED) PART 131_OPERATIONS--Table of Contents Subpart H_Markings for Fire Equipment and Emergency Equipment Sec. 131.820 Branch lines of fire-extinguishing system. The valves of each branch line in the fire extinguishing system must be plainly and permanently marked, indicating the spaces served.