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Old 07-12-2016, 09:15 AM   #15
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On my 2016 Grand Tour, the black tank flush check valve was installed backwards. Since there was no dealer close by, I repaired it myself. The check valve is about 18" above the floor on the street side behind the refrigerator and freezer. I removed the freezer (below the refrigerator) by taking out a few screws and sliding it out and forward to gain access. There are PEX connectors, so if you don't have the crimp tool, there are replacement fittings at Home Depot. The check valve was fine, just backwards.
I found a vacuum breaker valve along with the check valve. Both of these valves appear to be installed backwards. The supply line is on the right and the bottom line goes to the tank. You can see the water flow arrow on the valve going away from the tank. I don't know why you would need the vacuum break anyway as the check valve would prevent anything from the tank coming back out. I think the plastic float in the vac valve would hang up and cause a leak before the spring in the check valve would. I am going to replace the vacuum valve with just a 90 elbow so I won't have to change the Pex tubing.
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Old 07-12-2016, 11:19 AM   #16
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I found a vacuum breaker valve along with the check valve. Both of these valves appear to be installed backwards. The supply line is on the right and the bottom line goes to the tank. You can see the water flow arrow on the valve going away from the tank. I don't know why you would need the vacuum break anyway as the check valve would prevent anything from the tank coming back out. I think the plastic float in the vac valve would hang up and cause a leak before the spring in the check valve would. I am going to replace the vacuum valve with just a 90 elbow so I won't have to change the Pex tubing.

From your pictures I can't tell which line goes to the black tank. Is you back flush not working? Have you checked to see if you are actually getting a back flush in the black tank? It is easy to check. Just hook up a hose to the back flush inlet in the hose reel compartment, turn on water to this hose to start back flush. Then go inside bath and open toilet valve and you should be able to hear the water rushing into the black tank right under the toilet. If you do then the system is working properly.


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Old 07-12-2016, 01:24 PM   #17
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The vacuum break is likely an attempt to provide a code-compliant apparatus that would protect a potable water system hooked up to supply the flush water. A single check valve does not meet a code requirement for this service. The combination comes close.
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Old 07-12-2016, 01:32 PM   #18
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Correction. The codes I refer to are directed at residence and industrial applications. Jurisdictional authority comes under the supplier/purveyor so I guess it can push into "best practice" for an RV. If anyone knows otherwise please let me know.
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Old 07-12-2016, 02:17 PM   #19
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The vacuum break is likely an attempt to provide a code-compliant apparatus that would protect a potable water system hooked up to supply the flush water. A single check valve does not meet a code requirement for this service. The combination comes close.
Boxster,. No water to the spray head in the tank was what started this.

If the check valve hadn't been installed backwards on the vacuum / anti siphon valve and the water supply plumbed to outlet instead of the inlet it would have been spraying water everywhere behind freezer.

I agree about the code requirement but there is no fresh water to contaminate when the hose is disconnected.
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