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Old 12-29-2021, 10:15 AM   #2
Cummins12V98
Senior Member
 
Join Date: Feb 2013
Location: on the road
Posts: 1,188
If you don't have one get a clear 45 sewer fitting to attach to outside 3" discharge. Drain black tank, close black tank then turn on tank flush and run for 5 minutes. Open the valve, does a couple gallons of water flow visibly thru fitting? If so your flush is working.

I drain black then close valve and open flush valve and run for 10 minutes. SET A TIMER ON YOUR PNOHE!!! Now open the valve and when flow slower down close and repeat. Once that is done with tank drained close valve and let flush run for one minute then shut it off. Now your black tank is flushed and cleaned and ready for use.
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