Is there a proper name for the connection for the black tank flush connection. Mine is spraying every where on the back side of the fitting. I cant seem to find the same one on the net anywhere . It looks the same as the city water hook up. Iam assuming there is a back check valve in it.

Double check that the hose washer didn't fall out of the flush connection. I've had that happen and thought it was the connection when it was the lack of a hose washer in the connection.

Look up Black Tank Flush Valve or "Black Water Tank Inlet". They are basically the same thing as a fresh water inlet, but usually have a black cap. They have no check valves in them. The check valve is located in the anti-siphon device, usually located inside the bathroom sink cabinet. It looks like this:

Doogie in Elk Grove wrote:Double check that the hose washer didn't fall out of the flush connection. I've had that happen and thought it was the connection when it was the lack of a hose washer in the connection.Going by your post. I will have to agree with Doogie that you have lost the hose washer in the connection.

I have a 2016 cougar and twice I have had the elbow for the fresh water fracture and leak.you have to take the elbow off and shine a flashlight inside the elbow to see the crack the elbows were black in color and the replacements were gray and look like they are made a lot sturdy .one the dealer replaced and the next one I did.regular hardware stores didn't carry it.I found the elbow at a RV store and the parts department said he has never seen that elbow in black.maybe someone found a load of cheap elbows and installed them at the factory.i do use a pressure valve and the campground has low water pressure

I have found that some of these black tank flush inlets are located in a small space where it is really difficult to get a tight connection.At least for normal to large hands.On more than one occasion I have had a partial body shower from not getting the tank flush connection fully seated.

black tank flush hook up | Good Sam Community

BillB3857
Explorer
Jul 01, 2018
Do you use compressed air to clear the water from the line before winter freezes?
The way my Outback is plumbed, it will leave a hose full of water from the backflow preventer all the way down to the nozzle.
Cummins12V98
Explorer III
Jun 22, 2018
^^^^^. Just lucky! Someone on a DRV forum cane up with the parts.
DavinD
Explorer
Jun 21, 2018
Cummins12V98 wrote:
Me Again wrote:
Cummins12V98 wrote:
Mine were behind the access panel for the shower valve

What Ron said ^^^^^.

Many trailers have been flooded by these cheap plastic valves. On our 2005 Cardinal in was up inside the computer desk of all places. Leaked the first time I used it. Went MIA!

Chris

Wife kept blaming me for water on the floor!

How in the world did those 90 degree adapters and the splitter line up so perfectly?
Cummins12V98
Explorer III
Jun 20, 2018
Me Again wrote:
Cummins12V98 wrote:
Mine were behind the access panel for the shower valve

What Ron said ^^^^^.

Many trailers have been flooded by these cheap plastic valves. On our 2005 Cardinal in was up inside the computer desk of all places. Leaked the first time I used it. Went MIA!

Chris

Wife kept blaming me for water on the floor!
Me_Again
Explorer III
Jun 20, 2018
Cummins12V98 wrote:
Mine were behind the access panel for the shower valve

What Ron said ^^^^^.

Many trailers have been flooded by these cheap plastic valves. On our 2005 Cardinal in was up inside the computer desk of all places. Leaked the first time I used it. Went MIA!

Chris
Cummins12V98
Explorer III
Jun 20, 2018
Mine were behind the access panel for the shower valve
time2roll
Nomad
Jun 19, 2018
lee worsdell wrote:
Is there a proper name for the connection for the black tank flush connection. Mine is spraying every where on the back side of the fitting. I cant seem to find the same one on the net anywhere . It looks the same as the city water hook up. Iam assuming there is a back check valve in it.
Where is it leaking exactly?

Connect your hose to an: inlet
Near the spray nozzle might be a: back-flow preventor.
In the supply line you may also have a back-flow preventor or anti-siphon valve.
Could be the nozzle fitting itself.
classic_31
Explorer
Jun 19, 2018
I have been all through my camper and can find no anti siphon device I was thinking it had a check valve in the black water flush line.keystone paper work says if you have the black tank valve closed when you flush the tank you will over flow out the toilet but don't mention a anti siphon thing under sink or any place else. You would have to take the walls apart if it were located behind the shower .is it possible not to have one and only a check valve in the bk.flush line?It is a 2016 cougar
Cummins12V98
Explorer III
Jun 19, 2018
Just got rid of mine as they would leave a big puddle of water on the bathroom floor after flushing the tanks.

Filled the space with 1/2" PVC pipe and fittings.
Bipeflier
Explorer
Jun 19, 2018
DutchmenSport wrote:
Look up Black Tank Flush Valve or "Black Water Tank Inlet". They are basically the same thing as a fresh water inlet, but usually have a black cap. They have no check valves in them. The check valve is located in the anti-siphon device, usually located inside the bathroom sink cabinet. It looks like this:

Beg to disagree. My water hook up fitting has a check valve. The check valve is to prevent black tank water from entering the supply hose and water system.

Water inlet w/ check valve

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black tank flush hook up

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