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Old 04-17-2021, 06:19 PM   #1
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What is this

Found a leak under the sink in the 1/2 bath. Don't know what this is but it is leaking under the square head on top. It is not the Studer valve.
Thanks for your input.
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Old 04-17-2021, 06:32 PM   #2
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That is the vacuum breaker/check valve on the black tank flush line. They are notorious for leaking. The manufacturer even states in their instructions not to install it anywhere that you donít want to get wet.
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Old 04-17-2021, 06:43 PM   #3
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See line 7:
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Old 04-17-2021, 06:56 PM   #4
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Got a brass one on order. I'll just hold off flushing the black tank for a few days. Thanks
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Old 04-17-2021, 07:05 PM   #5
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That is the vacuum breaker/check valve on the black tank flush line. They are notorious for leaking. The manufacturer even states in their instructions not to install it anywhere that you donít want to get wet.


So thatís different than the AAV (Air admittance valve)?
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Old 04-17-2021, 08:12 PM   #6
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So thatís different than the AAV (Air admittance valve)?
I am no expert, but as far as I understand it, AAVs are installed on drain lines where it is not possible/practicable to install a typical vent line to the roof. Vacuum breakers are installed on supply lines to prevent siphoning.
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Old 04-18-2021, 07:14 AM   #7
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That is the vacuum breaker/check valve on the black tank flush line. They are notorious for leaking. The manufacturer even states in their instructions not to install it anywhere that you donít want to get wet.
Really ? Now Iím wondering if I have these on my 2015 DS 4369???

Thanks-I learn something every day, and the list of things to check gets longer and longer.
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Old 04-18-2021, 07:25 AM   #8
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I find it hard to believe that the black tank flush would require to run lines into the 1/2 bath for a siphon valve.

My question is where do the lines that connect to that valve go to inside the cabinet?
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Old 04-18-2021, 07:39 AM   #9
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When I was flushing my black tank there was noise coming from the cabinet in the half bath. I pulled off fake cabinet front (next to the real cabinets) and behind it was this valve as well as some electrical connections.
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Old 04-18-2021, 07:43 AM   #10
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When I was flushing my black tank there was noise coming from the cabinet in the half bath. I pulled off fake cabinet front (next to the real cabinets) and behind it was this valve as well as some electrical connections.
OK, next time I flush my BW Tank I'll go back inside and listen as well.

And next to electrical connections... a valve that is know to leak... doesn't seem like a good decision by Newmar.
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Old 04-18-2021, 08:04 AM   #11
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I just took some pictures. One correction though ... you can see the water lines and electrical box by removing the fake cabinet front, but to access the valve itself the drawer had to be removed.

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Old 04-18-2021, 08:11 AM   #12
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I find it hard to believe that the black tank flush would require to run lines into the 1/2 bath for a siphon valve.

My question is where do the lines that connect to that valve go to inside the cabinet?
Nevertheless, thatís what it is. It is a code requirement and is intended to prevent contamination of the community water supply by back flow out of the holding tank through the flush line. Mine leaked on our second use of the flusher and made a huge soggy mess. It is in the bathroom just because it has to be somewhere higher than the tank and (obviously!) needs to be accessible. It is just plumbed into the line between the water connection and the flush nozzle on the tank. In addition to being a cheap plastic part it also is subject to freeze damage if it retains a bit of water because most people donít think to blow out the line as part of winterizing. When mine failed I just eliminated it by bypassing it altogether. I cut the PEX lines where they went off towards the bathroom and connected them with a Sharkbite one way valve. I understand the code but there is zero chance of contaminating anything since my flush system has a separate hose connection and I only flush for a few minutes with me paying attention and there are now two one way valves in the system anyway (in addition to the one I added there is one at the nozzle in the tank).
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Old 04-18-2021, 08:13 AM   #13
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I just took some pictures. One correction though ... you can see the water lines and electrical box by removing the fake cabinet front, but to access the valve itself the drawer had to be removed.

Attachment 325426

Attachment 325427

Attachment 325429
Thanks for those pictures. My setup is a bit different, my cabinets are there next to the sink cabinets. I'll track down where mine is when we go away next week. Thanks again for the pic's
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Old 04-18-2021, 08:20 AM   #14
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Nevertheless, thatís what it is. It is a code requirement and is intended to prevent contamination of the community water supply by back flow out of the holding tank through the flush line. Mine leaked on our second use of the flusher and made a huge soggy mess. It is in the bathroom just because it has to be somewhere higher than the tank and (obviously!) needs to be accessible. It is just plumbed into the line between the water connection and the flush nozzle on the tank. In addition to being a cheap plastic part it also is subject to freeze damage if it retains a bit of water because most people donít think to blow out the line as part of winterizing. When mine failed I just eliminated it by bypassing it altogether. I cut the PEX lines where they went off towards the bathroom and connected them with a Sharkbite one way valve. I understand the code but there is zero chance of contaminating anything since my flush system has a separate hose connection and I only flush for a few minutes with me paying attention and there are now two one way valves in the system anyway (in addition to the one I added there is one at the nozzle in the tank).
Do you remember what pipe size was needed for the Sharkbite? When I locate mine I'll do the same, good idea. I actually use my outside faucet connected to a hose end which is connected to the water flush inlet. I have two shut off valves before the water can go into the flush inlet and only use it to flush the black tank after dumping.
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