![Image](http://www.defender.com/images/500402.jpg)
http://www.defender.com/product.jsp?nam ... id=3359116
A 1/2" piece of G10 will serve as a backer, after sanding the hull and curving the G10 to match the inside. Glue with thickened epoxy and boat on.
Spartan valves are very pretty, but you need to decide if your sailing and wallet require old school valves.
Marelon is an option too, if you are very thoughtful about the location. No, I would not put one in a locker where an anchor can bash it. The price is not much less than bronze for the 1 1/2" ones.
![Image](http://www.defender.com/images/500434.jpg)
Some think they are unwise, and I can see the argument. Lake boat, out of the water more than in? Plastic would be an option.
http://forums.sailinganarchy.com/index. ... -failures/
Rod's primer on installation is awesome:
http://www.pbase.com/mainecruising/replacing_thruhulls
A CD25 has a head, sink drain, and two cockpit drains? You may just want to plug the head drain.
Just looked at the Spartan price list. 1.5" seacock, $352. OUCH! Marelon is $114, Apollo is $154
Split the difference and put in Apollo flanged ones and you will be set.
Put any money saved towards Don Casey's book:
https://www.amazon.com/This-Old-Boat-Se ... casey+boat