Black Small Deck Seal Connector.83" Cables -.165"-.35"For connectors up to Ø21mm (0.83"). Cables from 4-9mm (0.165"-0.35")The only guaranteed and proven watertight installation for your antenna and navlight cables! The DS21-P provides waterproof cable routing and is produced in high impact plastic for cables from 4-9mm (0.165"-0.35").