I always used one of these "trout viewing station" for several reasons;
Observing the black tank draining to see if there was a problem,
back flushing,
most importantly, clearing a black tank clog at the valve.
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Adios, Dirk
'84 Real Lite Truck Camper, '86 Wilderness Cimarron TT, '07 DSDP, '14 Virtual RV
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