46 C.F.R. § 64.37
Valve and fitting guard
Each valve and fitting must be protected from mechanical damage by—
(a) The tank;
(b) A tank saddle;
(c) The framework; or
(d) A guard.
Each valve and fitting must be protected from mechanical damage by—
(a) The tank;
(b) A tank saddle;
(c) The framework; or
(d) A guard.