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Old 06-09-2013, 10:43 AM   #1
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Repairing crack in PVC

Hello Folks:
I have a crack in the PVC pipe that comes out of my black holding tank. It is next to the dump valve, so would be VERY difficult to cut it out and replace it.
Has anybody had to repair PVC on their rig and what did you use? Did a search and saw that JB Weld has a PVC/Plastic repair kit. Thought I might try that.
Any ideas? Suggestions?
Thanks
<Padre>
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Old 06-09-2013, 11:37 AM   #2
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Non pressurized PVC is a quick fix. JB Weld is fine but you need both the outside ad inside of the pipe completely dry. There are several liquids and solids available .My fix would be a strip of rubber roof patch (eternabond) around the pipe for a permanent fix
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Old 06-09-2013, 12:22 PM   #3
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Patch it.

Get a chunk of same or next larger size.

Cut a slit then with heat gun form to fit the pipe.

Then get purple primer and scrub both 3 times, use a lot of glue and tape to hold it tight until cured.
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Old 06-09-2013, 12:54 PM   #4
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Most of the sewer pipe on RVs is ABS and not PVC. I have seen a few with PVC. ABS will be black, PVC white. Different types of adhesives are used on the two. Some adhesives will work on both.
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Old 06-09-2013, 01:40 PM   #5
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My RV is a 30 year old Wanderlodge. The material that needs fixing is black so must be ABS..I guess.
Got some JB Weld Waterweld today. Am going to give it a try tomorrow and see what happens.
I first have to FIND the exact spot where it is leaking. Will be a MESSY job, I am sure. The inside of the pipe will be wet as there is no way that I can get inside.
If that doesn't work, I'll try some of the other suggestions. Just hoping to KISS if I can..but that seems to NEVER be the case, now doesn't it.
Thanks <Padre>
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Old 06-10-2013, 08:16 AM   #6
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I had the exact same problem

Quote:
Originally Posted by Padre View Post
Hello Folks:
I have a crack in the PVC pipe that comes out of my black holding tank. It is next to the dump valve, so would be VERY difficult to cut it out and replace it.
Has anybody had to repair PVC on their rig and what did you use? Did a search and saw that JB Weld has a PVC/Plastic repair kit. Thought I might try that.
Any ideas? Suggestions?
Thanks
<Padre>
I used Eternabond Tape (size of a roll of electrical tape) this spring and hasn't leaked since. It was on the Gray water side though not a lot of room to get it around the pipe. Pull it good and tight and it will seal it.
I really didn't think it would work but it did, and it was dripping while I was putting the tape on. I keep a roll in the MH right next to the duct tape.!!!
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Old 06-10-2013, 11:54 PM   #7
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I have repaired low and no pressure pipes by cutting a coupler in half and filing out the stop in the center. then glue it up and clamp it in place with tape. Good luck.
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Old 06-15-2013, 09:05 AM   #8
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jb weld makes a water weld product i read about it somewhere in this site bought some yesterday will give it a try tomorrow says it will seal thru water
i'm going to dry mine first will post results
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Old 06-15-2013, 09:13 AM   #9
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GOOP

plumbers GOOP

AG Plumbing Product Information 0709

Sure fire trick, works every time. Sticks to your fingers and everything else.
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Old 06-16-2013, 08:36 AM   #10
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I had a large crack in my black water tank that I noticed when changing out and updating my dump valves and the tanks are made of some kind of plastic that I cant remember right now but what I did was sand all around and in the crack wiped it down with a lot of lacquer thinner let dry then used a hot glue gun to fill the crack then taped off the area for nice clean lines and spread a thick layer of the goop style stuff that takes 24 plus hours to cure and pulled the tape off and let it dry and have no leaks since.
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