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skip97

09:11AM | 06/19/05
Member Since: 07/11/01
7 lifetime posts
Bvplumbing
I have a 4" PVC Schedule 40 soil pipe that has a very slow leak at one of the glued joints. Due to the location and configuration it would be very difficult to cut out the bad joint, insert new fittings and reglue. Are there any techniques or compounds that can be used to seal a leak like this in postion? Thanks

RayVinZant

05:13AM | 06/22/05
Member Since: 08/29/04
227 lifetime posts
What we do is to put a small vacuum on the piping. First cap off the riser going through the roof. Then put a long test ball in the main sewer line blocking it off to the street. Once this is done, you can use a vacuum pump to create less than a 1/8 pound of pressure on the system. This will allow you to suck cleaner into the leak. Once you have done the cleaner, you can put the glue on the joint and it will suck into the leak. Put quite a bit of glue on it and eventually it will vacuum all the way into the hole. Take the vacuum pump off and let it dry and it will be sealed. By the way, don't put higher than 1/8 pound of pressure or it will just remove all of the water from the traps. They can only block less than an 1/8 of a pound. They will still draw in small amounts of air, but they will not go completely empty.

Good Luck

Raymond VinZant Plumbing Prof.
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