The threads are just fine for the pipes. The listed different threads above is of great help in order to determine what particular size to be used. Just take note that it is important to install saltwater wash down to any boat regardless of its model so as to prevent rusting.
It is good to know that there is a website which you can find some manuals about piping and wiring. This will greatly help us in doing the job very well. It is worth saving the email address you had provided for future reference.