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Practical Seamanship / Boat Systems

Through-hulls and seacocks

Technical visualThrough-hulls and seacocks
Through-hulls and seacocksA hull cross-section showing a through-hull below the waterline, an identified seacock and a connected vessel system. Isolation depends on knowing the correct fitting and system.1IDENTIFIEDSEACOCKthrough-hull below waterline
Through-hulls and seacocksA hull cross-section showing a through-hull below the waterline, an identified seacock and a connected vessel system. Isolation depends on knowing the correct fitting and system.1BELOW-WATERLINE THROUGH-HULL2IDENTIFIED SEACOCK3CONNECTED VESSEL SYSTEM
Do not close an engine-cooling intake while the engine operates unless a vessel emergency or manufacturer procedure specifically calls for it.

Know the location and function of fittings below or near the waterline.

Good practice includes:

inspect regularly

exercise operable seacocks

identify valves

keep access clear

carry appropriately sized soft plugs where useful

know which systems can safely be isolated

Do not close an engine-cooling intake while the engine is operating unless the emergency or manufacturer's procedure specifically requires it.

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