Not sure about the tank layout on your rig, but on our 2012, the drain valve is at the rear end of the tank and the flush sprayer is at the front end of the tank, so for access, you will need to drop the entire coroplast to get to it, or at least drop the front portion of the coroplast. I've flushed our tank just about 52 times a year for the entire time we have had the rig, and have never had any problems with the flush system. We full time and with the two of us, weekly draining of the black tank is at the almost full level, and this works well. This is a photo of the flush line where it connects at the front of the black tank, so not sure what you would be able to do to unclog the sprayer.
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Bob & Becky
2012 3402 Montana
2012 Chevy 2500HD D/A CC
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