How to unclog a bathtub vent?

Are you referring to a vent that is on the exterior of the house, through the roof, or an under counter vent?

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Originally Posted by bx kid

How to unclog a bathtub vent?

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Your question's confusing so I'm going to assume that you have a stopped up tub drain and are asking how to snake it out. Correct??
Unscrew and remove the overflow plate,(The one with the drain lever) and pull out the tub stopper. You now have a clear shot at the trap. The way you were going in through the drain it ran you square into a tee that you can't get around. Now feed the cable( 1/4" best or 3/8" with a small auger tip. You can rent a Ridgid K50 sink cable.) About 2' down you will run into the bend of the trap. Crank and push at the same time to work around it. Your blockage will be found in the lateral pipe going to the stack. You shouln't have to put out more then 10 or 12 feet. I have found tub and shower clogs to be mostly hair and the worm should auger into it and pull it back. Hope this helps, TOM