little surprise every time we dump the tanks
on our 5er, there is a considerable length of pipe between the black water tank valve and the connection for the dump hose. as much as 5 feet or more. between the black water valve and the connection ...
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So we have a similar issue, only not black tank either gray or galley, have replaced the seals on the galley, but the black and gray tank outlets face each other and can't get enough movement to replace valves. So rather than break a fitting I can't replace, I went with the twist on at the last point. I now have no surprises!!
http://www.campingworld.com/shopping/item/twist-on-valve/27868
http://www.campingworld.com/shopping/item/twist-on-valve/27868
