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I found this plastic piece inside of a 3/4" copper pipe. Is it a random discovery, or a leftover from the manufacturer, or some type of water reducer?

see-through pipe

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  • I was thinking it was a cap to keep the pipe clean. HVAC pipe and tubing are shipped purged of air and have end caps so the pipe doesn't get moisture inside the pipe.
    – Ed Beal
    Apr 11 at 15:41
  • It looks like the remains of a two-hole laboratory stopper. A giveaway is a slight taper.
    – HABO
    Apr 11 at 15:56
  • This piece was found inside the pipe, so not an end cap (unless maybe for a 1/2"). This is straight sided, and plastic; I think the lab stoppers are rubber?
    – dabi
    Apr 12 at 3:07
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It's a flow restrictor. They are usually installed in shower heads or other types of plumbing fixtures. It was probably left in a tool box and found it's way into the pipe or was intentionally not installed... I hated those things.

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  • I don't think so. I have never seen one like this. But maybe it is a hillbilly version. A shower would dribble with this thing in the main pipe.
    – DMoore
    Sep 8 at 19:38
  • @DMoore I've removed many like this from hotel showers. then put them back when I checked out. Yes, the shower damn near dribbled.
    – JACK
    Sep 8 at 20:14

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