Drain seal

Oatey Drain seals are designed to block odor, gases, and bugs from entering through the drain, while also allowing continuous water flow 👀
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Available in 2" and 3" 👍

[jimbob]

I think this is meant to be used if you have an infestation of cockroaches living in your drain lines.

[nAK]

Isn’t P-trap already supposed to do that?

[roaktree]

its supposed to be used instead of a p trap, only its not a reliable system