Cougar 29BHS Black Tank Flush blocked

[bacase]

On our Cougar 29BHS - I tried using the black tank flush over the weekend and it appears to be blocked. I was using a flow meter on the hose and it showed no flow at all. So I pretty sure it's not a leak but rather a blockage. I have seen where the back-flow valve can cause this issue - anyone know the location of this valve? give the black tank is below the toilet/shower - could it be behind the shower faucet? Just looking for a place to start before I start rooting around in/under the camper.

Any other reason why the black tank flush would be blocked? Trailer is only a few months old and we do this was working when we picked it up from the dealer (dealer demonstrated it to us).

Thanks!

[Javi]

Originally Posted by bacase

On our Cougar 29BHS - I tried using the black tank flush over the weekend and it appears to be blocked. I was using a flow meter on the hose and it showed no flow at all. So I pretty sure it's not a leak but rather a blockage. I have seen where the back-flow valve can cause this issue - anyone know the location of this valve? give the black tank is below the toilet/shower - could it be behind the shower faucet? Just looking for a place to start before I start rooting around in/under the camper.

Any other reason why the black tank flush would be blocked? Trailer is only a few months old and we do this was working when we picked it up from the dealer (dealer demonstrated it to us).

Thanks!

This is what it looks like... it will usually be under the bathroom vanity sink but it can also be stuffed behind the shower wall accessed via the shower faucet plate.

About 50% of the time that people think the flush is blocked it is the anti-siphon valve installed backwards..

Second photo is how I FIX mine when I buy a new trailer...

[BlueJay Traveler]

Mine 2019 26 rbs black tank flush was plugged this summer. I removed the end piece and cleaned out the part with all of the little holes. It appeared to be toilet paper and was maybe plugged because I let a 3/4 filled tank sit for a week. Not to sure. I was not impressed that the sprayer was located about half way up on the tank.

[flybouy]

Originally Posted by BlueJay Traveler

Mine 2019 26 rbs black tank flush was plugged this summer. I removed the end piece and cleaned out the part with all of the little holes. It appeared to be toilet paper and was maybe plugged because I let a 3/4 filled tank sit for a week. Not to sure. I was not impressed that the sprayer was located about half way up on the tank.

The spray head id desigbed to spray water in a 360° pattern. That's why it's mounted 1/2 way up on the side of the tank.

[dutchmensport]

Originally Posted by Javi

...

Second photo is how I FIX mine when I buy a new trailer...

OMG! OH how horrible! You are gonna die! You are gonna contaminate the entire campground water system! It's gonna back flow into the entire city water system and the whole friggin' country's water system is gonna get contaminated, maybe the entire planet will die! ..... and on and on ..... were the comments fired back at me when I posted a similar "fix" I did on a previous camper and posted it on a different camping forum.

It's a good fix! It's your camper. do it your way! Bah-humbug to these germ-a-phobics!

[RVGator]

Try a higher pressure through the hose. I had a similar issue and cranked up the pressure and it finally unclogged.