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If the fittings are plastic, 13 years of stress by towing and water pressure will take a toll and cause failures. My recent experience with my Jacuzzi hot tub at home, after 12 years, 2 plastic fittings to the pumps both started to leak. The fix--repair with metal fittings. In addition the plastic hose was to tight and it contributed to the cracks. OK--not in an RV but it is a similar experience--RV builders use the cheapest part available--and 13 years is beyond what they ever thought the fittings would last--they just wanted the rig to get out of the parking lot for a minute!
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