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JRadtheNoMad · 05-11-2021, 06:41 PM

As a continuation to an earlier thread and narrowing it down to a specific question. Does anyone know the location of the black tank flush anti siphoning valve on a 2001 Magna Indulgence? I've checked under the bathroom sink, the bathroom wiring channel and cannot locate it...

phays · 05-11-2021, 07:01 PM

On my 2000 Magna I located it by looking at the plumbing schematic and measuring from the hose connection on the outside of the coach. So I measured up then toward the front of the coach and so on. That gave me an approximation where it should be inside the coach. I then went inside and guessed a bit and came to the conclusion it was behind the closet opposite my bathroom sink. In my case I had 2 lower drawers below a closet and I removed the drawers and saw two pex tubes running side by side upward. I then removed the back wall of the closer and viola!

I replaced mine with a Valterra A10-3050 Check Valve/Vacuum Breaker. It is easy to do if the connections are the same.

birdhunter · 05-12-2021, 08:24 AM

In my 02 Magna it turned out to be in the compartment behind the sink in the bathroom with the toilet. In my coach there was the water heater and a linen closet there. I think it was in with the water heater. I removed it and threw it away.

stonegully · 05-13-2021, 09:02 AM

What are the symptoms if the anti-siphon valve malfunctions?

**CountryFit** · 05-13-2021, 10:38 AM

Quote:

Originally Posted by stonegully

What are the symptoms if the anti-siphon valve malfunctions?

These anti siphon valves are pretty cheap and known to fail often. The symptoms are mostly breakage and flooding or blockage. Some people replace them with a quality brass one or just delete it and use a check valve at the hose connection.

Griffin379 · 05-13-2021, 02:28 PM

Thank you Pete. Another winning answer. I have looked in many places but never in that closet. Thank you.

phays · 05-13-2021, 03:59 PM

Symptoms of failure for these valves is usually one of two problems.

One, the valve doesn't close after you've flushed your tank and black tank odors get into the coach. That's what happened to me. I chased the odor for about two years before I realized that valve was installed.

The second way it can fail is it does not seal when flushing and water flows into the coach. I saw this happen to a friends coach.

Smitty77 · 05-13-2021, 11:11 PM

Quote:

Originally Posted by phays

Symptoms of failure for these valves is usually one of two problems.

One, the valve doesn't close after you've flushed your tank and black tank odors get into the coach. That's what happened to me. I chased the odor for about two years before I realized that valve was installed.

The second way it can fail is it does not seal when flushing and water flows into the coach. I saw this happen to a friends coach.

A third way that they fail, is to not allow flowing to the actual flush valve within the tank. If you can get access to the, often times people have had luck cleaning the Anti Siphon Valve with White Vinegar and or CLR, and get them to function again. But if they're in a tough location, and stop working, I'd go the higher quality metal Anti-Siphon Valve, to hopefully make a onetime repair

!

Smitty

JRadtheNoMad · 05-26-2021, 06:24 AM

Just to follow up, I did locate the vacuum check valve, behind the false backboard in the hallway closet. Problem solved and thanks to all for the valuable information.