External black tank flush fitting b/o - Technical Tips and Tricks

G’day, I have a 2004 Forest River Wildcat 27RL 5th wheel TT. There is an external “San-T-Flush” fitting that is used to flush the black water tank when dumping. The last 2 trips out, I connected the hose to the fitting and the water would not flow. Normal water pressure but no flow. I don’t know

External black tank flush fitting b/o - Technical Tips and Tricks

External black tank flush fitting b/o - Technical Tips and Tricks