Drain sounds

[dan orourke]

..........

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[Michael Larson]

Don't know for sure.
It should not gurgle if the system is free flowing on the drain and vent side.
It may indicate a slow or blocked drain downstream of th bath drain.

[Billy Stephens]

I filled a bathroom sink to rim. When I let it drain, everything sounded fine. Very quiet. At the very end when the last of the water was draining out, a loud gurgling noise was heard.

A defect or not a defect?

Dan,

If the drain water is swirling at the end of the end of the drain cycle thats a good thing.

If it's bubbling at the end it's a bad thing. Sound or no sound.