How to Diagnose a Gurgling Sink | Ask This Old House

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recently i was out of the house and i

flushed the toilet i would hope so

sorry immediately grab the cameras take

a look they always bring a camera

now listen


the elusive gurgle so that tells me

without looking that that toilet wasn't

vented okay i can only be vented through

the lavatory a thing called a wet fence

so what is it that i'm hearing what is

that gurgle where's it coming when that

slug of water leaves the toilet it's

going there and there's air in the pipe

and it's going to be looking for air

behind that slug of water and it needs a

place to find it the only place i could

actually find it was pulling it the

wrong way down through the drain right

here right next to the toilet now when