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Old 06-03-2019, 08:42 PM   #1
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Leak on City Water Inlet Fitting

On my 2016 Vista LX 30T I have a small leak (cups a day) on the city water connection fitting. Drops appear between the flange and mounting service. It appears to be a low pressure leak when I am not hooked up to city water - which never happens. I am not certain on the configuration of this plumbing and would appreciate any suggestions on how to stop the leak.
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Old 06-10-2019, 07:05 PM   #2
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Try buying a 90 degree brass hose elbow. Brass fittings have sharper threads and mate better with plastic fittings. The 90 degree coupling also relieves stress on the plastic fitting. https://www.walmart.com/ip/Camco-90-...uwRRoCQBzw_wcB

EDIT. Also available from Amazon and many others.
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Old 06-10-2019, 11:40 PM   #3
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There's a check valve built into the city water connection fitting. The OEM versions are usually cheap plastic and frequently leak after a few years. You can replace the entire fitting or add a new brass check valve just inside of the connection.

I replaced one on the fresh water tank fill fitting and the new unit also leaked. Added a brass valve and problem solved. Make sure you use a spring type and not a flapper gate type of check valve. You can get easy to install SharkBite check valves or ones with pipe threads.

You stated it only happens when not hooked up to city water? If the water pump is/has been on, then the water system is under pump pressure and depending on how your rig is plumbed this pressure could be forcing small amounts of water out of the city connection as you report.

I've added four or five new check valves to prevent/fix several problems in the MH which I have never seen in our Excel 5th.
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Old 06-11-2019, 09:51 PM   #4
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rarebear.nn would you happen to know what size Sharkbite valve would be required. I see a 1/2x1/2 on Amazon that several commenters say they used on RVs.
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Old 06-11-2019, 10:06 PM   #5
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Quote:
Originally Posted by hfbundy View Post
rarebear.nn would you happen to know what size Sharkbite valve would be required. I see a 1/2x1/2 on Amazon that several commenters say they used on RVs.
Most RVs use 1/2" PEX pipe. The standard 1/2" SharkBite fittings will work well with standard 1/2" PEX. Most of the SharkBite product packages list PEX as one of the suitable pipes.

All you need is a way to make a clean cut in the PEX. Order a PEX pipe cutter and make life simple. Some other methods will deform the shape of the PEX and render it difficult to make good connections.
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