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I am replacing a shower spout in a shower ~30years old. The copper pipe protruding through the wall has a brass fitting which appears to be permanently attached to the copper pipe. I do not see any solder or thread between the two pieces. The brass piece has a few threads near the wall and the other end has an o-ring. I purchased a universal spout with various front and rear end mounts but none seem to work. The rear end fitting adapter is too narrow to slide over the entire brass fitting. The original spout has a thick plastic insert threaded near the wall and has a solid (non-thread) section near the mouth of the spout for the o-ring to seal. Any ideas on this type of fitting and where I might get a new spout that will fit? Maybe a new o-ring too. Thanks,
Most of the nipples protruding from the wall are 1/2" copper tubing, the spouts are normally 1/2" threaded or slip fit depends on which one you got see the Images below, you say that the copper pipe (nipple) is threaded to the fitting inside the wall and free end has an O ring, it sounds like you have a slip fit spout and the O ring from the old spout, bring the old one with you to Home depot or Lowe’s find best replacement. A universal fit will work best!!
For the slip fit use a little silicone GREASE to lubricate the new Oring just prior to installation so the new Oring doesn't bind and break.
For threaded one you will need some Teflon tape, good Luck.
Thanks for the great illustrations. As it turns out, I went to a local plumbing supply warehouse. My spout is a Delta product. I was able to purchase a direct replacement and back out (from the new spout) the brass insert containing the short thread and brass section with o-ring. I left the original brass insert on my plumbing and just swapped the o-ring. The new spout works great. Thanks again for the reply.