Assertion: umbilical cord | /r/HasProperty | 1⁄ 4 inch
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text: For shallow water surface supply air diving, the diver's umbilical is typically a 3-part umbilical comprising a 3⁄ 8 inch (9.5 mm) bore breathing gas hose, 1⁄ 4 inch (6.4 mm) bore pneumofathometer ("pneumo") hose, and diver communications cable, which usually also serves as a lifeline strength member.