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Old 07-17-2014, 08:39 PM   #1
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Intermittent Leak

Does anyone know what this black device is? Looks like it has a flow arrow. I have a small leak that ends up in my basement. It is just below the water lines from my bathroom sink. I am trying to figure out if I have some water running down the outside of one of my lines. I cannot get to all the connectors to tighten them except by hand. I hand tightened the hot and cold to the faucet (cannot get pliers in there) and I used pliers to tighten the connectors going to this black device. I have a total of 4 lines directly under the sink. 3 cold and one hot. One hot and one cold go to the faucet and the two additional colds are attached to the black thingy majig. When I shake the black thing a few drops of water come out.

There are also PEX connectors in the basement that are just above where it gets wet, but I do no think those are the problem. I wrapped some paper towels around the hot and cold lines going to the faucet to see if they get wet. I was camping five days ago and had water when I parked but none for the remainder of camping. Didn't have water yesterday when I relocated (thought it might happen during the tow) but did today. Haven't been doing anything different since I relocated than I did in the five prior days.

Any assistance appreciated. Just wondering why they connected two cold lines through this device.
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Old 07-17-2014, 09:11 PM   #2
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Anti-Siphon device, or backflow preventer. Required by RV industry to install on black flush system. We always cut them out, as most all have or will leak. In theory, it's supposed to keep black water from coming from the tank back into your hose. But, if you've seen how the nozzle is installed in the tank in reference to the tubing and inlet, it's virtually impossible to siphon through those tiny holes even if you're tank is above half full where the nozzle is. Just cut it out, and use a inline version from Lowes or HD at the inlet, and also use a designated hose.
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Old 07-17-2014, 09:14 PM   #3
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I say cut it out. Sounds like yours is installed like mine was, under the bathroom sink. I traced the lines back into the basement, and back as close to the inlet as possible, and made a new connection there. Got rid of probably 8 feet of pex in the process.
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Old 07-17-2014, 09:44 PM   #4
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Quote:
Originally Posted by Davidceder View Post
Does anyone know what this black device is? Looks like it has a flow arrow. I have a small leak that ends up in my basement. It is just below the water lines from my bathroom sink. I am trying to figure out if I have some water running down the outside of one of my lines. I cannot get to all the connectors to tighten them except by hand. I hand tightened the hot and cold to the faucet (cannot get pliers in there) and I used pliers to tighten the connectors going to this black device. I have a total of 4 lines directly under the sink. 3 cold and one hot. One hot and one cold go to the faucet and the two additional colds are attached to the black thingy majig. When I shake the black thing a few drops of water come out.

There are also PEX connectors in the basement that are just above where it gets wet, but I do no think those are the problem. I wrapped some paper towels around the hot and cold lines going to the faucet to see if they get wet. I was camping five days ago and had water when I parked but none for the remainder of camping. Didn't have water yesterday when I relocated (thought it might happen during the tow) but did today. Haven't been doing anything different since I relocated than I did in the five prior days.

Any assistance appreciated. Just wondering why they connected two cold lines through this device.
That is actually a vacuum breaker required by Public Health and enforced by plumbing rules. In the last 20 years they are fitted to hose bibs, utility sinks, campground water supplies etc. The one looks like a economy model and used a flap to prevent backflow but not seating properly on proper flow. Easy to eliminate but you'll be the first victim if something backs up. Ever lost water pressure?, that's when it happens. Small holes maybe, coliform and other goodies are smaller yet!
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Old 07-17-2014, 10:03 PM   #5
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I'd just get a new one and move it where it doesn't hurt if it leaks.
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Old 07-17-2014, 10:27 PM   #6
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VinceU, that's why I said install one at the inlet and use a designated hose. Ever look at a No Fuss Flush system, or any of the aftermarket systems you can install? Where is the vacuum break, at the inlet. Better to cut out and get it out of the camper and install one at inlet than deal with the possible flood as I've had. I know they're required, but there are better ways of doing it.
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Old 07-17-2014, 10:33 PM   #7
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VinceU, that's why I said install one at the inlet and use a designated hose. Ever look at a No Fuss Flush system, or any of the aftermarket systems you can install? Where is the vacuum break, at the inlet. Better to cut out and get it out of the camper and install one at inlet than deal with the possible flood as I've had. I know they're required, but there are better ways of doing it.
Agree Big John, mine was installed behind the washer Dryer at near 150#s next to impossible to get to. It should be installed outside just as long as the vertical height is the same as original.
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Old 07-18-2014, 05:52 AM   #8
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Which camper do you have. Curious if mine is located in the same place on a sabre 36qbok


2015 Sabre 36QBOK-7
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Old 07-18-2014, 11:46 AM   #9
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Hey guys, thanks so much for the quick responses but now I am a bit confused (easy to do) I have not as yet followed the plumbing from the anti siphon to the black tank flush. I was just wondering why an anti siphon device is needed as part of the RIGS plumbing system if the black tank flush is a stand alone system with no tie into the rigs fresh water system? Are you guys saying that this is installed for the sole purpose of making sure there is no back flow into the designated hose hose I attach outside my rig to flush the black tank? Is that correct? I can see why this would be necessary but a complicated implementation. And what is this about keeping the same vertical height? Can't I just eliminate the current siphon and put something on the end of my designated hose. Wont be at the same vertical height though. Thanks much
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Old 07-18-2014, 11:47 AM   #10
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Pirate;

I have a Sabre 32RCTS. Look up under your bathroom sink just below the hot and cold faucet fixture.
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