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Compass Marine How To | all galleries >> Welcome To >> Seacock & Thru-Hull Primer/Pre Information > This is NOT a seacock!
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This is NOT a seacock!

The title says it all! Simply threading a ball valve, or in-line valve as pictured above, onto a thru-hull (top photo on this page) is not a proper seacock. Sure, many sailors refer to any thru-hull mounted valve as a seacock but in the proper sense threading a ball valve onto a thru-hull or mushroom head is not a "proper" seacock.

This ball valve shows what can happen, in less than a year, using cheap "yellow brass" valves purchased from Home Depot. This valve was literally a week or two away from catastrophic failure of the boat sinking type!

As I've said, and will continue to say, USE ONLY marine rated valves of either bronze, stainless steel or Marelon and DO NOT buy valves for your boat at hardware stores or home centers like Home Depot!

Nikon D70s
1/200s f/4.5 at 50.0mm full exif

other sizes: small medium large auto
RamblinRod 02-May-2012 15:59
Marty, while salt water is more agressive than fresh, standard brass has no place below the waterline, fresh or saltwater. The only difference is the amount of time, not if the standard brass fitting will fail.
Guest 01-May-2012 21:49
That looks exactly like the one I took off of my boat! Well, removed is not exactly right, I went to loosen the valve and the "Home Depot" adapter sheered off. Since then I have replaced everything with the proper flanged seacock, bedding, sealant and proper grade of stainless steel fasteners. I've been aboard a boat that the seacock sheered off in, and believe me, the amount of water that comes in through a 1" diameter hole will definitely get your attention!
Marty 18-Nov-2008 22:40
Doesn't this ONLY apply to salt water applications and where brass meets bronze???