Testing drain air vent


Old 03-08-13, 02:36 PM
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Testing drain air vent

I have a suspicion that drain air vent is clogged. I noticed that there is no cap on the top of the vent on the roof (may have been damaged after the recent storm/flew off) and the other one has some water in it. How can I test it? I wanted to stick a rigid wire down the vent from roof but if there is something blocking the way i don't want it falling down into the drain pipe and clog the whole system.

Any suggestions?
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Old 03-09-13, 08:23 PM
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What makes you think that it's clogged? There maybe a one way flap there.
Old 03-10-13, 02:29 PM
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Most plumbing vents don't have any cap. They get larger as they work their way down the house, so it's unlikely for things to get caught. Though squirrels and other critters are occasionally creative in what they put down the pipes, so it does happen.

A hose would be a good way to figure out if the pipe is blocked at all. You may be simply hitting an elbow in the pipe which is not allowing the wire to continue through.
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