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I have tried jb weld products, expoxy and water expoxy and water tape. I do not want to replace the pipe just fix it for now?

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Are you are talking about a supply line or a drain line? –  bib Jul 30 '13 at 13:52
    
main cold water supply line –  user14261 Jul 30 '13 at 14:06
    
it's ridiculously easy to repair PVC by just cutting out the bad section. why have you not done that yet? –  longneck Jul 30 '13 at 14:50
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Anything glued on the outside is resisting pressure after it has exited the containment. Think Blister. The pressure under the blister is as high as the internal pressure of the pipe till it strips the patch off and starts leaking again... Temporary patches like you've tried are temporary and from personal experience may only gain you 24-48 hours which if it's your copper main hot water lines, gives you just enough time to find all the fittings and pipe so you can spend your weekend finding all 20 other incipient pinhole leaks as you R&R the whole system. –  Fiasco Labs Jul 30 '13 at 15:02

2 Answers 2

Your best bet to fix the leak is to turn off the water, drain the line, and then cut out the bad section and replace with some new glued in fittings and pipe pieces.

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Pipe Repair Clamp

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http://www.lowes.com/pd_24521-143-PP24001_0__

There are quite a few different styles; however, almost all of them are designed for metal pipes. Personally, with PVC I still suggest replace a section of the pipe, but if you can't this will get by in a pinch.

Make sure to prepare the surface. Turn the water supply off, sand the area (get rid of your epoxies and rough up the surface). For a good seal, I'd add some 100% silicone "caulking". then put the clamp on. The clamps come with a rubber gasket and if you are using a universal size one then be extra careful not to crack the pipe, it takes a bit but is surprisingly easy when using tools. Allow a couple of hours for the silicone to dry (most dry times listed are expecting surface air to help dry/cure it so if you can manage it leave it overnight)

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Works only if the leak is in a straight part of the line (pinhole unlikely in PVC, more likely a split) and not a joint. If the joint is leaking due to bad solvent weld, replacement is the only way that the leak will be repaired. And silicone applied between the rubber and piping will tunnel unless allowed to fully cure. –  Fiasco Labs Jul 30 '13 at 18:38

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