[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: 46CFR109.333] [Page 170-171] TITLE 46_SHIPPING (This book contains parts 90 to 139) CHAPTER I--COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED) PART 109_OPERATIONS--Table of Contents Subpart C_Operation and Stowage of Safety Equipment Sec. 109.333 Fire main cutoff valves. The master or person in charge shall insure that each fire main cutoff valve is open and sealed to prevent closing, except that a cutoff valve may be [[Page 171]] closed to protect the portion of the fire main system on an exposed deck from freezing.