Bronze vs Brass thread types

[Timmy!]

I am FINALLY going to my ballast install and last year I bought a brass ball valve and it has "gas pipe" threads so it didn't mate up with my bronze thru hull for the bottom of the boat. Are all of the bronze thru hulls the same thread type? My buddy is picking me up a bronze 1 1/4 ball valve and I just wanted to make sure that I don't need to specify a thread type or something. Also, while at Lowes I played around with pvc parts and the all mated up to the brass ball valve fine but now I am worried that I won't be able to find PVC that matches up to the bronze threads. Am I missing something here?

[chpthril]

In my experience, household type brass plumbing stuff at the local hardware stores will be NPT type threads and marine type plumbing will be bronze stuff with MST (machine straight threads)

Nothing wrong with the brass hardware store stuff, just may be hard to match up the threads.

[Timmy!]

How does the pvc match up to the MST stuff?

[Timmy!]

Are you sure it is MST and not NPS?

[Pro-Fab]

from my findings most thru hulls are nps which will fit and work with npt as long as you use plenty of tthread tape and stay low pressure. the NPS means strait thread and NPT is tapered thread.

[Timmy!]

Thanks Pro-Fab, that's exactly what I figured out over the weekend.