Instructables

How to drain an RV's black and gray tanks.

Step 2: Find the Valves

 On our RV the valves are on the backside towards the rear, on most RVs I have noticed that it is hard to miss. Look under your Rv for a large pipe and some handles. Ours is easy to find and plainly labeled "Waste Water" for the sinks and shower (this is also known as the gray water) and "Sewage Water" (also known as the black water).
 
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