There may be 2 -- one for the fresh water tank, & one for the water lines. On our 282 RK the hot & cold water line drains are directly below the water heater. You have to crawl up under the trailer to get to them. Dont't know if your 30qbss is laid out the same though. We also have the fresh tank drain under the step side too.
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Mark, Vicki, & Scout THE dog
2015 Hemisphere 282RK
2016 GMC 3500HD Duramax dually
1992 Goldwing Aspencade
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