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Compass Marine How To | all galleries >> Compass Marine How To Articles >> Seacock & Thru-Hull Primer/Pre Information > Thru-Hull, Flanged Adapter Plate & Bron
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Thru-Hull, Flanged Adapter Plate & Bron

Thru-Hull, Flanged Adapter Plate & Bron

This picture shows the complete assembly minus the boats hull. Note that the handle clearly states Marine Rated. Use only Marine UL rated valves and seacocks for below water line applications.


Many insurance companies demand this for coverage and insist on marine rated valves so don't cut corners here.




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bob 01-Mar-2015 17:44
The problem with the flange adapter base choice is that there are no good shut off valves to add to them. You talk about UL rated, but if you go look they are UL rated for fuel applications, NOT THRU HULLS. The Groco valve you are showing is a chromed BRASS ball. On the other hand, their seacocks are a solid stainless ball, Conbraco seacock a chromed bronze ball, Perko seacock a polymer/plastic ball. I really wanted to do the flanged adapter base, but after extensive research I could find no decent bronze shut of valve that had a ball appropriate for a thru hull. Check out - and be careful, some of the catalogs are not giving the correct info.
kevin 19-May-2013 03:16
Can this be used i=on aluminum boats as well? I want to install a wash down pump on my jet boat but want to ensure safety first and foremost/
VIAGO 27-Jun-2012 23:41
THIS IS MAKING ME CHECK MY HULL TOMORROW.
The question i have with the separate flange system is that could adding a second joint into the equation add to the risk of springing a leak? i know from my attempts at home plumbing that the fewer joints the better!!!!
VIAGO 27-Jun-2012 23:41
THIS IS MAKING ME CHECK MY HULL TOMORROW.
The question i have with the separate flange system is that could adding a second joint into the equation add to the risk of springing a leak? i know from my attempts at home plumbing that the fewer joints the better!!!!