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Old 10-09-2021, 09:16 AM   #4
BB_TX
Montana Master
 
Join Date: Oct 2006
Location: McKinney
Posts: 7,169
M.O.C. #6433
How many water pipes are going up thru the floor to the shower? Hard to tell from the picture. If four pipes going up then it is very likely your black tank flush valve is in that wall with the shower fixture as Daryl said. Two for the shower and two for the flush valve.
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Bill & Patricia
Riley, our Golden
2007 3075RL (recently sold, currently without)
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