Thru hull fittings – below the waterline

30 Mar

Below waterline thru hull fitting

I often see this problem on smaller older sailboats. A drain for a sink or cockpit drains that go to a below the waterline  thru hull fitting. Even though this installation was very solid it is still not safe without a seacock. To conform to ABYC  H-27 or Transport Canada TP 1332 section 3.3.1 below the waterline thru hull fittings shall have a seacock in order to shut off underwater penetrations. A ball valve is the best type of seacock for this application. Apart from saving you from sinking in the event the hose comes loose it will also allow you to do maintenance on piping etc. without having to haul your boat.

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