On our rig, you can access the valve by removing the plastic barrier behind the convenience center and maybe one section of the basement wall. You will not be able to get to it from under the rig, because the drain is above the tanks. I guess, as you have found out, there should be no reason to run a snake into any of the plumbing in these rigs, because you risk damage to the plumbing and also can damage a tank if you go that far with the snake. The only thing I do occasionally is use a small bottle brush to clean the Hepvo valve, which is attached to the drain fitting in the floor of the shower. We also have one under one of the bath sinks, and when that gets plugged, it has to be removed to clean it.
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Bob & Becky
2012 3402RL
2012 Chevy 2500HD D/A CC 4WD
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