I have a old Delta tub spout right now. It unscrews and what I see is a fitting sweated to the pipe. The fitting is threaded near the wall, but also has a o- ring about an inch further (away from the wall). The spout has threads right at the wall end. What kind of connection is this called? I've seen names like "1/2 NPT" , "3/4 NPT" , "1/2 male pipe" , "1/2 male threaded" , "3/4 make threaded". It's making it hard to find a new replacement, I don't really want to sweat a new connection or change the connection type. Thanks