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Old 01-08-2018, 06:08 PM   #1
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National RV Owners Club
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Black Tank Flush

My 2004 Tropi-Cal has a "Tank Flush" hose fitting on the outside panel where the outside shower is. Mine does not work. It will not accept water. It just sprays back at me.

Does anyone know where I can purchase a replacement? It looks simple enough, just two screws to remove it.
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Old 01-08-2018, 06:23 PM   #2
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The nozzle inside the black tank is stopped up probably. If you remove the connection you won't see the nozzle. Go to Valterra website and look at the diagram of the " no fuss flush" and you will see the installation of the system.
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Old 01-08-2018, 06:24 PM   #3
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Check valve in the line is probably installed backward....
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Old 01-08-2018, 11:49 PM   #4
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Could be like mine and the fitting is just worn out. I can move the hose end around and minimize the spray. I have anew one just need to instal.
Can you hear water running? If you close the drain for a few seconds with the flush "running " then open it do you get water out? If so it may be like mine.
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Old 01-09-2018, 01:15 AM   #5
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Nozzle in tank clogged/plugged
Anti-siphon Vacuum Breaker could be bad but they typically leak water all inside RV when that happens (Installed up high inside bathroom sink cabinet or closet or behind shower wall OR OR ---they put them in the dangest places)

The connection MAY have an internal check valve like city water connection but most times not

Anti-siphon Vacuum Breaker can be cheap plastic Junk (black one), little better (White/Clear Plastic) or a Brass one

Water supply connects to bottom of it and then goes out side to the tank nozzle
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Old 01-09-2018, 01:18 AM   #6
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My Dolphin has a Swan San-T-flush your is probably the same.

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Old 07-21-2018, 07:10 PM   #7
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Did you try a new washer in the end of your hose had to ask you would be surprised
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Old 08-03-2018, 04:34 PM   #8
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Bad Fitting

It turns out Tahiti16 is the winner! Replaced the fitting and allís well. Not sure whatís going on inside the tank but it seems to be working. My black tank gauge still doesnít work though.
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Old 08-05-2018, 08:00 PM   #9
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Mine did the same thing, turned out the vacuum breaker was clogged with stink bugs. Mine was easily accessible through a removable panel behind the toilet.
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Old 03-01-2019, 11:42 PM   #10
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The best way to fix gauge is to open waste valve outside and pass a hose through the bathroom window with a toilet flush rod on it. They are a couple feet long with a valve where it connects to the hose and a right angle high pressure nozzle at the business end. Turn off water to coach, insert the rod all the way down the toilet to the tank and just turn the rod 360 degrees cw then ccw. Keep doing this until you dissolve the dried paper and poop from your sensors. I do this twice a year and the gauges read well. My rod is plastic and cheap, but it works. Be patient. Also if you can fill the tank with soapy water it comes off easier the first time.
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Old 03-04-2019, 12:32 PM   #11
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If your gauges dont work go on YouTube and search tank techs rx watch a few videos and get an idea whats going on inside your tank the stuff aorked great for me the first time i did it i filled the tank completely then added some ajd let itnsitnfor about 3 months until my next trip
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black tank, tank

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