Join Date: Jan 2007
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Well, "proper seacock" police notwithstanding I used hose over threaded fittings on my boat.
The fittings are "marine brass" - whatever it is. One was purchased at West Marine, specified for, presumably, salt water connections, the other was already on board (and in the same place for about 10 years, looked pretty good though). I do watch them closely and plan to continue doing so.In any case similar marine fittings from other materials don't seem to exist.
To the point, what seems to help create a watertight seal is a teflon tape over the threads, and a good quality multilayer hose over that - plus double clamping. These are my cockpit drains and both of them are as dry as any connection gets - so far anyway. Certainly if there was any leakage, even the smallest amount - it would be very visible, as these thru hulls are never closed.
BTW, a recent BoatUS magazine has an article on thru hulls, and while they *recommend* flanged seacocks, they certainly don't say that that is the only right option, and in fact they do show a thru-hull mounted ball valve as an example of acceptable installation. This is acceptable to their insurance as well.