Originally Posted by Clonetrooper
I always drain gray tank first, to see if all connections are ok then switch to black tank then back to gray when black tank empties. Gray water is less messy than black if you do have a leak. Then I flush both tanks. I put a $9 twist on clear elbow on drain pipe just past valves so I can see when water coming out turns clear when flushing tanks. My Discovery has Tornado tank flushers (like having 10 little car wash sprayers in tank) on both gray and black tanks and it really makes a difference. Dont know what the hole on your flusher is, maybe vacum breaker.
I have Bounder and you did empty your tanks in the correct way, the gray water tank does not have a San T connection only the blackwater where there is solid waste and paper. The San T water connection should not leak, is there by chance a hose washer missing in it ?. That fitting goes to sprayers inside the black water tank to flush out the tank and the sensors telling you how much is in your tank, BUT Bounders are not noted to have the best sensors and you have to at times fill your blackwater tank half full of water and go for a drive to clean it better, good luck.