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Can I Repair a Cracked Holding Tank On My RV?

by Mike Mueller

Hi all.....

I have a 1984 Terry Taurus Lite fifth wheel, that has developed a slight (crack) in the black water holding tank.

The leak is in a spot that is easy to get to, and if I hold a magnet to tank, it will not stick. So I would like to know what material the holding tanks are made from. Then try a patch.

Thanks for any info..

Mike Mueller

ANSWER: Greetings Mike thanks for submitting your question on our Ask An RV Question Page.

The good news is that most RV holding tanks are made of Acrylonitrile Butadiene Styrene (ABS) which is normally black in color. ABS plastics can be effectively melted by certain chemicals making repairs quite feasible. All you need is an ABS Plastic Holding Tank Repair Kit and based on the location of the leak you should be able to repair the tank yourself.

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The bad news is if the holding tank on your RV is milky white or milky grey in color then it is in all likelihood made of Low Density Polyethylene (LDPE). As far as I know there is really no way to effectively patch these tanks and the tank will probably have to be replaced.

I hope this helps.

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