Thin black plastic strip on bathroom trap?

Old 09-16-17, 01:16 AM
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Thin black plastic strip on bathroom trap?

I installed my bathroom drain line just a month ago. I opened the trap and discovered thin black needle like plastic strip. What is it and where it comes from?
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Old 09-16-17, 03:59 AM
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If you're sure nothing was into the drain, then I'd say the plastic is deteriorated. Bad mfg. process. If you cut it open I'll bet the inside is peeling away. Use a flashlight and look into the trap. Does it look bad? Could be left over plastic from the mfg process that never got cleaned out.

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