Originally Posted by Wood Family
We have a 2022 Raptor 352. We know how to flush the main black tank but how do you flush the black tank for the 1/2 bath in the garage?
If there's not a port near the outside of that bath somewhere then one of the wands designed for that or an old piece hose down through the toilet is the only way. Or dump a couple buckets of hot water down the toilet.
Most likely that 1/2 bath has the sink draining into the black tank as well so it gets more water which helps.