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Old 07-17-2018, 03:16 PM   #11
Javi
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read these threads... especially the first... http://www.keystoneforums.com/forums...ack+tank+valve

http://www.keystoneforums.com/forums...lack+tank+anti
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Old 07-17-2018, 04:57 PM   #12
sourdough
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Originally Posted by Keystone half ton View Post
Hi Iím new to this forum just bought a new 5th wheel I used it this past weekend I tried to use the black tank flush valve when I turned the water on it didnít sound like it was going into the tank and the hose was building up pressure I shut it off right away the dump valve was open any suggestions thanks keystone half ton🤔
The anti siphon valve will do what you describe. It could be defective or backwards. You can fix it yourself, or, since it's new have the dealer fix it. You can spend $15-20 and be done with it or wait for a slot for warranty repair, wait for the fix and then get it back - that would be your call. If your dealer is nearby and efficient you may want to use them, if not ??

Mine was defective upon purchase. They just bypassed it and I use the anti siphon attachment Javi listed in the first thread.
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Old 08-05-2018, 02:47 PM   #13
Keystone half ton
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The water supply line going to this is backwards can I just bypass this the way it goes on I would have to turn it up on itís side
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Old 08-05-2018, 03:22 PM   #14
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The water supply line going to this is backwards can I just bypass this the way it goes on I would have to turn it up on itís side
Take the goofy plastic anti-siphon valve out and replace it with 2 - 90` elbows.. then use one of these on the outside hose connection... https://www.homedepot.com/p/Everbilt...Z4EB/205815672


A word of caution... always use a pressure regulator on this line... that cheap plastic in the tank won't handle much pressure above 40 psi..
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Old 08-05-2018, 03:42 PM   #15
Keystone half ton
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Thanks I will do that,
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