The check valve to the flush kit is spring loaded and requires water presure to overcome the spring.the black tank will not hold presure as there is a vent out the roof AND if the drain valve is open it dump there also.As for the water coming out the hose conection it's just hose expantion bleeding off UPSTREAM of the check valve--no worry.
You realy can't get black water to flow up and out the flush kit connection.
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Steve & Sandy
2006 GMC Duramax-Edge Evolution
2011 CT29RLX
Bikes,Canoe,toys,toys,toyz
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