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Old 12-15-2022, 05:53 PM   #2
JRTJH
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Join Date: Mar 2011
Location: Gaylord
Posts: 26,841
There's a reason Keystone posts the warning "Do not use the black tank flush system with the dump valve in the closed position"...

They post that because it's easy to be forgetful... Close the valve, plan on running the flush system for 6 minutes, set the stopwatch to make sure, then get busy with a dog that broke its leash or a kid that falls off their bike or even a DW/DH that yells for help on the other side of the trailer.... Next thing you know, there's an "OH SH** MOMENT" and you suddenly remember that running flush system about the same time that brown stuff rolls out the bathroom door....

It is potentially the same with a lock on air chuck... If you've ever seen a 175 PSI compressor air up a 80PSI maximum pressure tire with a lock on chuck and had the tire valve suddenly pop and the tire "whoosh away for several minutes" or walked back to the tire to realize there's 160PSI in that 80PSI tire......

There's a "useful purpose" for lock on tire chucks just as there's a useful purpose for closing the dump valve when filling the black tank with "sprayed water".... The "trick" is to know when to use them, know when to walk away and NEVER count your luck to keep you safe if you can't tell the difference..... <sung with my best Kenny Rogers voice> ...
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