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Old 10-02-2017, 09:36 PM   #1
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Black Tank Sprayer

When dumping my black we got a large leak. Fortunately my wife was in the bathroom and hollered at me to turn off the water. After cleaning up the mess I discovered that a plastic piece connecting two hoses had came apart spraying everywhere. I assume that one hose delivers the water and the second directs it to the black tank sprayer below the floor line.

I tried to reattach the part but it must be faulty as it came apart when o tested it. Anyone know what this part might be and if it is easy to find. I'm nowhere near an Rv store and was hoping I could get the part from a local plumber if I knew what the part is called or what it's function might be.
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Old 10-02-2017, 09:39 PM   #2
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Black Tank Sprayer

It is a vacuum breaker. The cheap plastic versions all RV Mfg install have been known to fail. Best to replace with a brass version.

Should be able to get at hardware store. You can also just get fittings and remove until it is replaced.

https://www.amazon.com/Cash-Acme-173.../dp/B000MNLNF6
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Old 10-02-2017, 10:48 PM   #3
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Thanks for the rapid response. Checked out your link and read the reviews which were good the only problem is that this device has no check valve. Do you think this will will be a problem.
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Old 10-02-2017, 11:03 PM   #4
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The device in link IS a 'anti-siphon vacuum breaker backflow' device




You probably have a cheap BLACK PLASTIC type


They all function same .....some are just better made. The cheap plastic ones are JUNK



Supply water from hose connection enters via bottom hose
Flush water to tank sprayer nozzle exits via side hose


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Old 10-02-2017, 11:12 PM   #5
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They can also leak if you don't supply enough water pressure to them. Believe they need at least 40psi to close up.
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Old 10-02-2017, 11:50 PM   #6
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I have a clear plastic one which looks like the set up in the picture. You guys have been very helpful, thanks. Looks like I have a project for tomorrow.
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Old 10-10-2017, 02:49 PM   #7
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Believe you need this item to fix. Can only get it from one supplier. It's called a Vacuum Breaker/Check Valve item code 1000 Price $25 plus $8 shipping.
Lakeview RV Supply, Inc. PO Box 16002 Sugar Land, TX 77496 (512) 261-8000 Cell: (512) 694-1673 tabbdye@lakeviewrvsupply.com
Will try to attach picture - whenever we flushed water all over under bat sink.
Couldn't attach picture to a reply so will see if I can do it another way. It's a see-through diaphragm item.
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Old 10-10-2017, 02:59 PM   #8
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Picture of one we replaced - see post where I purchased.

Quote:
Originally Posted by traveler of california View Post
When dumping my black we got a large leak. Fortunately my wife was in the bathroom and hollered at me to turn off the water. After cleaning up the mess I discovered that a plastic piece connecting two hoses had came apart spraying everywhere. I assume that one hose delivers the water and the second directs it to the black tank sprayer below the floor line.

I tried to reattach the part but it must be faulty as it came apart when o tested it. Anyone know what this part might be and if it is easy to find. I'm nowhere near an Rv store and was hoping I could get the part from a local plumber if I knew what the part is called or what it's function might be.
I found the part at below place/only supplier I could find. I posted a reply but couldn't post a picture of the one I replace so trying it this way.
Vacuum Breaker/Check Valve item code 1000 Price $25 plus $8 shipping.
Lakeview RV Supply, Inc. PO Box 16002 Sugar Land, TX 77496 (512) 261-8000 Cell: (512) 694-1673 tabbdye@lakeviewrvsupply.com
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Old 10-10-2017, 03:01 PM   #9
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As others have said, the vacuum breaker is not unique to RV's.

Every household hot water tank has one made from Brass. In order to replace the existing plastic version, you will need to also buy two 1/2" NPT Brass Close Nipples to allow reconnection of the plastic lines to a Male Connection.

This device is readily available at any Ace, Home Depot, Lowes etc.
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