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Does it look like this:
Could you post a picture or two of your problem area?
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Are you sure it's actually rubber? Is this tubing by any chance gray in color? Can you see a brand name on it anywhere?
It is greay in color but no, I don't see a brand name on it anywhere. It feels like ruber when I cut it but could be some other substance I guess.
It looks just like that and is about 1/2".
It had a connector like the one in the picture you posted but it keeps leaking with that on it. Is there anything else that can be used?
I believe you have polybutylene piping, which was commonly used in manufactured housing for a number of years. Unfortunately the stuff deteriorates over time and was eventually discontinued. It also was the subject of a large class action lawsuit a few years back.
I simply do not know enough about the stuff to make a recommendation on how to repair it. You might want to see if you can find a online forum where plumbers hang out.
Ok thank you for your help'