seacocks again
 

hey guys thanks for the info on the fiberglass blocks. I am confused as to the threads on the parts. I was going to use a groco tri flange 3/4'. I think it comes wf nps threads top and bottom. Valve should be nps also? The groco bronze thru hull is nps also correct? I'm confused...Red

try this
 

Red,

Try this..

Seacock & Thru-Hull Primer (LINK)


http://www.pbase.com/mainecruising/image/118833015.jpg

seacocks
 

Ol mainesail, that helps, That is the groco tri flange I am going to use. It has a nps on the bottom side and the thru hull is male nps, apparently the top of the tri flange[male end], I can install an npt ball valve.Then the 3/4" hose barb is also npt. I like the idea of the tri flange, in case of valve failure. ....Red