Section 34.50-20 - Semiportable fire extinguishers-TB/ALL(a) The frame or support of each size III, IV, and V fire extinguisher required by table 34.50-10(a) must be welded or otherwise permanently attached to a bulkhead or deck.(b) If a size III, IV, or V fire extinguisher has wheels and is not required by table 34.50-10(a), it must be securely stowed when not in use to prevent it from rolling out of control under heavy sea conditions.CGD 77-039, 44 FR 34132, June 14, 1979