46 CFR §197.312

1. (a)Each breathing supply hose must—
   1. (1)Have a maximum working pressure that is equal to or exceeds—
      1. (i)The maximum working pressure of the section of the breathing supply system in which used; and
      2. (ii)The pressure equivalent of the maximum depth of the dive relative to the supply source plus 100 psig;
   2. (2)Have a bursting pressure of four times its maximum working pressure;
   3. (3)Have connectors that—
      1. (i)Are made of corrosion-resistant material;
      2. (ii)Are resistant to accidental disengagement; and
      3. (iii)Have a maximum working pressure that is at least equal to the maximum working pressure of the hose to which they are attached; and
   4. (4)Resist kinking by—
      1. (i)Being made of kink-resistant materials; or
      2. (ii)Having exterior support.
2. (b)Each umbilical must—
   1. (1)Meet the requirements of paragraph (a) of this section; and
   2. (2)Be marked from the diver or open bell end in 10-foot intervals to 100 feet and in 50-foot intervals thereafter.