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Old 05-16-2018, 06:50 AM   #21
Jerry Roberts
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I think it has to do with water pressure and possibly coupled with a loose fitting. The main clue is that the problem goes away when you use water which reduces the pressure. The regulator you are using maybe allowing the pressure in the lines to slowly creep up when there is now water usage. It is had to tell without a pressure gauge.
I had leaking under sink with adjustable water regulator and found the leak by letting the hot water heater pressure build up and that started the leak. If air gap in hot water heater was sufficient, no leak, but if not it would leak when pressure built up from the hot water. I fixed it by better securing the fitting, just tightened them.
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Old 10-02-2018, 07:42 AM   #22
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I have two water leaks at the elbows on the hot/cold lines going to my bathroom sink they are the blue/red pex lines with the silver crimp band any ideas on how to tighten them?
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Old 10-02-2018, 08:12 AM   #23
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Unless you have (or buy/borrow) a PEX crimping tool, chances are you can't successfully tighten those crimped bands. Probably easier and less costly would be to purchase a couple of Sharkbite elbows, cut out the leaking elbows and replace them with the Sharkbite connectors.
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Old 10-02-2018, 08:15 AM   #24
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There are 2 types, one is a solid band, the other has a small square shaped notch sticking up, you can get the tools for Pex piping at most home improvement stores for which ever type band you have & try retightening them, worked for me.
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Old 10-02-2018, 08:35 AM   #25
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The two types of crimps are shown here. Crimp rings are all I've ever seen as OEM on Keystone trailers. The Crimp bands are significantly more expensive (about $3 each vs 30 cents each) and Keystone (at least by reputation) is much too cheap to use the expensive type. And as TT said, there are specific tools for each which are not interchangeable.
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Old 10-02-2018, 01:00 PM   #26
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The two types of crimps are shown here. Crimp rings are all I've ever seen as OEM on Keystone trailers. The Crimp bands are significantly more expensive (about $3 each vs 30 cents each) and Keystone (at least by reputation) is much too cheap to use the expensive type. And as TT said, there are specific tools for each which are not interchangeable.
The 2nd picture is the only type used on my 5er & the tool to crimp them fits every size used on my 5er. The "bands" in the 1st picture require a different tool with various sizes inserts to fit different size bands.
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Old 10-02-2018, 01:39 PM   #27
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I don't think the pressure has anything to do with it. Fittings can leak after a while with the travelling. Where is it leaking...at the crimp or the threaded part that screws onto the faucet? Probably just a bad connection. Pex tools are expensive. You'll need a crimp ring remover also. I would just cut the pipe next to the crimp ring and unscrew the fitting. Screw on the proper sharkbite fitting with some teflon tape to the faucet and push in the pex as JRTJH suggested. You should have some slack in the pipe to do this.
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Old 10-02-2018, 03:54 PM   #28
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Ahh.. memories of our first time out with our brand new TT
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Old 10-02-2018, 04:33 PM   #29
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I think it has to do with water pressure and possibly coupled with a loose fitting. The main clue is that the problem goes away when you use water which reduces the pressure. The regulator you are using maybe allowing the pressure in the lines to slowly creep up when there is now water usage. It is had to tell without a pressure gauge.
I had a similar problem once and started with too much pressure,, after that even with a regulator I would only turn water on outside a turn or a little more,, then go in and check pressure, if it was enough would leave it alone,, if not give it another 1/4 turn and so on
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Old 10-02-2018, 08:44 PM   #30
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[QUOTE=RagingRobert;310012]I don't think the pressure has anything to do with it. Fittings can leak after a while with the travelling. Where is it leaking...at the crimp or the threaded part that screws onto the faucet? Probably just a bad connection. Pex tools are expensive. You'll need a crimp ring remover also. I would just cut the pipe next to the crimp ring and unscrew the fitting. Screw on the proper sharkbite fitting with some teflon tape to the faucet and push in the pex as JRTJH suggested. You should have some slack in the pipe to do this.[/QUOTE

Most pex fittings have a cone washer in them that don't require Teflon tape & hand tighten only.
Also by only partially opening the faucet you are reducing the flow not the pressure which is what the cheapo so called water regulator they probably gave you with your rv does also. A good quality regulator is recommended.
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Old 10-03-2018, 12:49 AM   #31
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Danny...pretty sure the one side of the SHARK fitting that screws onto the faucet threads needs Teflon tape. I've never seen a Pex fitting with a washer in it...I'm talking elbows/couplings/tees (you said most fittings) those plastic ones that screw onto faucets yes they do. The water pressure has nothing to do with the leak IMO. A good connection will not leak regardless of the pressure unless it's extreme...then you'll want it to leak or it will probably burst.
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Old 10-03-2018, 01:50 AM   #32
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Danny...pretty sure the one side of the SHARK fitting that screws onto the faucet threads needs Teflon tape. I've never seen a Pex fitting with a washer in it...I'm talking elbows/couplings/tees (you said most fittings) those plastic ones that screw onto faucets yes they do. The water pressure has nothing to do with the leak IMO. A good connection will not leak regardless of the pressure unless it's extreme...then you'll want it to leak or it will probably burst.
The fittings that screw onto the faucet itself, should have a rubber washers inside it, so they would not require to be Teflon taped.
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Old 10-03-2018, 01:57 AM   #33
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The Pex no tape....a female Sharkbite fitting you need tape
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Old 10-03-2018, 02:46 AM   #34
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Iíve never used Teflon tape on shark bite fittings, just the cone washers.
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Old 10-03-2018, 08:37 AM   #35
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If you're using a pex fitting with pipe threads on one end, yes use Teflon tape, but as I said pex fittings have the cone washer, no tape needed. Even the braided hoses to connect to water supply lines under the sink have the washer, no tape.
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