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Compass Marine How To | all galleries >> Compass Marine How To Articles >> Seacock & Thru-Hull Primer/Pre Information > These are called Thru-Hulls
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These are called Thru-Hulls
11-JAN-2008

These are called Thru-Hulls

This item is called a thru-hull or sometimes a "mushroom head". They are straight threaded (NPS thread) so they can be cut to the correct length for your hulls thickness and then be threaded into a female straight threaded seacock or a flanged adapter. The one on the right has already been cut to length. Most all thru-huls installed into proper seacocks will need to be cut to the proper length.


When installing them with a proper seacock the nuts are not used.


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Nikon D200
1/60s f/4.0 at 36.0mm iso100 full exif

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Cameron 19-May-2012 12:38
Flush mount vs mushroom mount for engin water intake anyy advantage to flush mount?
Guest 18-Apr-2012 06:39
where are the comments?