Black flush anti-siphon valve

[firetrucker]

The black tank flush system stopped working on this trip, and I finally had time to check the anti-siphon valve under the sink. It looks like there's a check valve on the output side of the valve that's stuck closed, and I can't get at it.

Now the problem is to find a replacement. Camping World doesn't seem to have it, and a Google search hasn't helped either.

Does anyone have a source for this anti-siphon valve?? It's a Lakeview R.V. model 1000.

Bob

[mtnhntr]

Try a Montana dealer. A dealer in Tacoma WA had them for about $40 several months ago. Mine is also stuck, but I am going to try to free it up when I get a chance. If that doesn't work, I will buy a new one.

[RC and Samantha]

Here is a whole a RV Check Valve This is what we had to replace when we had the same problem. These seem to be pretty cheap and my experience with Ebay has been very good. There are several suppliers in the Ebay Stores.

Hope this helps?

Patty

[tundra rose]

I believe this is the contact information for Lakeview RV:
Lakeview RV Supply, Inc
608 Flamingo Cove
Austin, TX 78734
Telephone: (512) 261-8000
Fax: (512) 261-7722
Products:
Plumbing Supplies & Equip.

I had a similar problem with our 2004 2955RL and found that it was not the antisiphon valve inside the sink cabinet. The holes in the spray head nozzle inside the black water holding tank were clogged with dried TP.

You can check the valve by removing it(disconnecting both lines) and connecting it to a water source. As I recall, I was able to remove the shower head and connect the hose to the input port. In my case, the valve worked fine.

If it's the spray head - two possible solutions: (1) let the holding tank soak with a heavy duty cleaner, e.g. Thetford Level Gauge Cleaner for a week or so; (2) mechanically clean the holes (which I let the local RV shop do, since I decided not to become a plumber many years ago).

[Les and Julie]

I was very interested in your posts and problems with the black flush. Although we have had no problems (yet) with our black tank flush, we do get a little water back when I disconnect the line from the outside of the trailer after I flush and disconnect my hose. I checked the line which runs from the external hose connection then under our counter and finally disappears into the basement through the floor under the counter, and see no check valve anywhere. Am I missing something? I assume the anti-syphon valve would be quite obvious. Any thoughts on this would be appreciated!

Les

[bncinwv]

Les,
Do you disconnect the hose from the tap first and let it drain before disconnecting from the convenience panel flush inlet?? I experienced the same exact thing, and since doing this have not had a problem. Hope this helps,
Bingo

[ols1932]

Guys,
In answer to another topic about using different color hoses for fresh water and back flushing, that's why I mentioned that UNLESS you have a known good antisiphon valve in the back flush line, DON'T use your fresh water hose for back flushing. I believe the water that you are seeing when you remove the hose is actually seepage back through the antisiphon valve. Be cautious.

Orv

[bncinwv]

Orv,
I agree with what you are saying about the hoses and adhere to the different colored hose philosphy (that are both now in the propane cylinder compartments thanks to suggestions on this forum), but to clarify my statement: ours is a new unit and the slight back flow I was seeing was caused by the hose still being pressurized (possibly water from the inlet to the check valve). When I would loosen the hose from the convenience panel first, the water pressure itself caused a little flow out of the inlet (not enough to be concerned about). When I started loosening the other end of the hose first to depressurize and drain the hose, the slight leakage (backflow from the valve??) ceased. Live and learn I guess.
Bingo

[bosan]

I asked my dealer for a plumbing diagram and they said none was available. It seams to me we owners should be allowed to have plumbing as well as wiring and hydraulic diagrams for our units.

Actually, why aren't they included in the 'owner's manual'?

[firetrucker]

In my 3400, the anti-siphon valve is under the sink in the bathroom. The water you get at the outside connection when you disconnect the hose is due to the anti-siphon action of the valve, which is higher than the connection (it breaks the potential siphon action from the tank at the valve, but allows the water to siphon from the valve back through the supply line, which means you don't have to winterize it). In addition, the check valve keeps any of the water, as well as any gases/odors, on the tank side of the valve from being drawn back or escaping under the sink. It's that check valve that has locked up on me, preventing any water from making it into the tank to flush it.

The combination of the anti-siphon and check valve should keep any black water or other contaminants from getting into the supply hose, but, just as Orv said, "should" is enough to make me have a separate hose for the flush function.

Bob

[firetrucker]

In my 3400, the anti-siphon valve is under the sink in the bathroom. The water you get at the outside connection when you disconnect the hose is due to the anti-siphon action of the valve, which is higher than the connection (it breaks the potential siphon action from the tank at the valve, but allows the water to siphon from the valve back through the supply line, which means you don't have to winterize it). In addition, the check valve keeps any of the water, as well as any gases/odors, on the tank side of the valve from being drawn back or escaping under the sink. It's that check valve that has locked up on me, preventing any water from making it into the tank to flush it.

The combination of the anti-siphon and check valve should keep any black water or other contaminants from getting into the supply hose, but, just as Orv said, "should" is enough to make me have a separate hose for the flush function.

Bob

[Les and Julie]

Thanks for the responses. Interesting topic!

In our old (2004) Monty there is no "convenience" center and the hose bib connection is well above the tank and the piping flows downhill all the way from the connection to the black tank. I am wondering whether an antisyphon valve was installed on my unit (I couldn't see one anywhere). Can anyone answer whether we should have had an anti-syphon valve?

By the way, we know this is a huge health issue and we have two hoses and never use our fresh water hose for anything but fresh water.

Thanks, Les

[Bob & Lee]

I have not had problems yet but have been looking..not been able to find the valve under the sink..but did find one in the panel under the tub. When I disconnect the black water back flush I get a short burst of water, which I thought it was the water in the line up to the valve I found under the tub..

[Glenn and Lorraine]

Funny this subject came up and all of a sudden I can't get any water into my flush.
Since I already have an appointment this coming Tuesday at the service center I'll let them figure it out and report back on their findings.

[sreigle]

Someone mentioned the holes being blocked with dried TP on theirs. I wonder if using one of those valves used to blow out water lines with compressed air when winterizing would be of use? Maybe apply enough air pressure to clear the clog?

[rlrich]

My anti-siphon valve began leaking. I called the black tank flush manufacturer in Austin, TX and they sent me a new one at no charge.