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If your motorhome has been in storage for a season or more, this is likely what you’ll find when you remove the cover — dirt, dust and spider webs. In fact, there was still a spider present when we took this photo.
Next, check the emergency relief valve by pulling up on the handle. Water from the tank should start to trickle out of the valve if it is working properly. If the valve is sticky or won’t move, it must be removed with a pipe wrench and replaced.
Here is a plastic drain plug from an Atwood unit that is several years old. Note the silt residue caused by water-tank corrosion and infrequent maintenance. Metal plugs should not be used.

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