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Compass Marine | all galleries >> Compass Marine "How To" Articles >> Seacock & Thru-Hull Primer/Pre Information > This is a Flanged Adapter Plate
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This is a Flanged Adapter Plate
11-JAN-2008

This is a Flanged Adapter Plate

This is a relatively new item in seacock technology. It allows the use of an NPT threaded ball valve on the top and a NPS threaded thru-hull then threads into the bottom.


As far as I know these are currently only made by Groco. The benefit is that even if the valve wears out you simply thread a new one onto the flange. This avoids a very time consuming job of removing the thru-hull, thru-bolts and seacock and then having to re-install these parts and fair over the bolt holes.

Nikon D200
1/60s f/4.0 at 24.0mm iso100 full exif

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Barry Jones 30-Jan-2013 05:44
Thank so much, you saved me a lot of time.
Ray 12-Mar-2012 03:33
Forespar offers MARLON flange adapters.
Brett 05-Jun-2008 19:23
Where'd you buy this? Do they differing sizes? Thanks!