Our 06 Beaver Monterey Ventura IV has the original Hydro-Hot water heater, which works just fine. On a recent trip, I noticed a puddle beneath the unit and the expansion tank was empty. I also noticed the cap on the expansion tank was split sideways preventing a good seal. I made a hasty gorilla glue/tape repair and replaced the cap. No more leaks were present. Once home, I contacted Hydro-Hot (now Aqua Hot) and asked about the cap. They could only replace the entire expansion tank-not just the cap. The cost was $140. I found the cap on Amazon, part Number Dorman 924-1058. It's an exact replacement for the original cap and only cost $7.00.
