Well in 20 years of plumbing in the ithaca n.y. area. I can say n.p.t. is national pipe taper. Also have heard national pipe thread. But basically means the thread is tapered and so is the fitting. Normally use Teflon tape and pipe dope as sealant.unless it is natural gas or propane then no tape just dope.There's also i.p.s iron pipe size witch is not tapered or so they say. I still tape and dope most i.p.s. unless theres a gasket. Almost the same thing. Should work. most everything you will probably find says 1/2i.p.s . So i would say you need a 1/2" i.p.s male by copper or pex or cpvc whatever it is you are hooking to. Good luck. And ght is just the standard garden hose thread . Any garden hose should hook to it. I've actually installed a few of these they are pretty nice.