Where a mast is stepped on deck the mast cables, typically antenna coax and navigation light wiring, have to be routed through the deck to their destination below. The method of achieving this must be water tight, rugged enough to resist damage from the feet of crew working around the mast and should be of a shape that avoids snagging lines.
Deck plugs for each individual wire are notoriously prone to rust, corrosion and leakage. Deck glands are better because any joint in the cable can be made below decks. Unfortunately both methods are prone to damage by being stepped on by crew working around the mast. Another available method is the swan neck tube but this has the disadvantage of snagging sheets and lines if not carefully sited.
There’s another solution: The Swedish manufactured Cableport is a low profile stainless steel Dorade-type vent that can be stepped on with impunity and shrugs off rain and green water over the deck. The patented Cableport’s sleek profile avoids line snagging and looks attractive.
The cables enter the Cableport via slots on each side and are routed below through a 49mm diameter pipe within. The wire entry slots are sealed with rubber gaskets. Any water that enters around the cables is prevented from going below by the upstand around the pipe as you can see in the drawing.
The Cableport is standard equipment on many fine yachts and is available from Salty John – there’s a link over there on the right.