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Compass Marine How To | all galleries >> Welcome To >> Replacing Thru-Hulls and Seacocks > The Dogs
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The Dogs

This photo shows the dogs or ears inside the thru-hull that allow the slot on the step wrench to grab hold and break it free or tighten it.

Nikon D70s
1/60s f/4.0 at 62.0mm full exif

other sizes: small medium large auto
Guest 30-Aug-2010 01:32
Be careful--the dogs on the newer Groco thru-hulls are very fragile and will shear off with any substantial torque on the thru-hull wrench
Guest 03-Jan-2008 21:44
Should have read ahead before asking questions.
Thanks again, Hugh