Two questions..... 2003 coach, U295<br/><br/>1. When I run the black tank water flush there seems to be a lot of back pressure when I remove the hose (i.e., water comes gushing out....maybe a pint or two). Is it some sort of a spray arrangement inside the tank? Could it be plugged? There is small amount of water getting through.... I can see it coming out.<br/><br/>2. The other day a...