Has anyone installed a Sioux Chief Wallnut?
http://www.siouxchief.com/PDF/shwnbrch.pdf
Looks like a good idea, but no one here in NC stocks it and they all want you to buy a box of 50 to order it. Roughing in my house with two shower and this looks to be the way to go to prevent leaks inside a wall.

Thanks
JT in NC