Through-hull

A fitting that passes through the hull to admit or discharge water (for engine cooling, heads, sinks, etc.), almost always fitted with a seacock.

Test your knowledge

Know your nautical terms? Play the free SkipperCheck daily maritime quiz — COLREGs, navigation, VHF radio, seamanship. Earn points, climb the global leaderboard.

Play the Daily Quiz →

Related T-terms

Tide

The periodic vertical rise and fall of the sea surface caused by the gravitational pull of…

True wind

The actual wind speed and direction relative to the ground — what a stationary observer at…

Tackle

An arrangement of blocks and line that provides mechanical advantage.

Tiller

A horizontal handle (or extension) fixed to the rudder stock, used to steer a smaller yach…

Tune

To adjust the tension and alignment of the standing rigging so the mast stands straight an…

Tail

To hold, and keep tension on, the free end of a line while a winch grinder takes turns on …

← Back to full glossary