I have something similar, but without the extra blade valve. Similar to (but not exactly) like this: http://www.campingworld.com/shopping...dro-flush/2096
What is the purpose with the extra blade valve ?? Seems like that would hamper the connection when twisting on the Flush King ??
1 thing that has developed on my flush kit is that the anti-syphon valve has started to leak when dumping the tank, resulting in some black water leaking to my driveway.
I remedy that by cutting a small flow on the fresh water hose while dumping.....just enough to put some pressure on the anti-syphon valve.
The Flush King and similar products like mine probably don't do a lot for an entire tank rinse, but should help with buildup and blockage around the discharge line.
Chap , DW Joy, and Fur Baby Sango
2006 Ford F150 Super Cab 4x4
2008 Surveyor 263