There is a long, thin, rubber-y line wrapped around/connected to the water line pictured below.
Other angle:
The piece in question is loosely hanging via a zip tie on my main water line about shoulder height and can be moved up/down easily.
this post was submitted on 21 Sep 2025
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What is this thing?
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Let us help you identify that mysterious object you’ve found.
Currently in CHALLENGE mode: If you've got something obscure knocking about, post a picture, and let's see how we do. Please prefix such posts with "CHALLENGE:" so we know we've got a fighting chance.
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https://www.amazon.com/Itron-100W-Communication-Module-ERW-1300-403/dp/B0DSJ1XD12 <-- It's this (or another model in that line). I zoomed into the image and could decode "ERW-1300" and Duck duck go did the rest.