Re: Drains, valves, and seacocks: weighing the alternatives
I use the type 316 stainless ball valves from the pulp mills, found in scrapyards for $1.50 a pound. They have given me no problems in 40 years. For thru hulls, I weld in type 316 stainless pipe nipples, also from scrapyards for $1.50 a pound. A composting head also eliminates a couple of thru hulls.
For my steel hulls, I use keel cooling and dry exhaust, eliminating a couple more thru hulls.
Brent Swain, Boat designer, Builder, and author of "Origami Metal Boatbuilding"