Pex water line question - Fiberglass RV


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Old 03-11-2013, 11:38 PM   #1
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Pex water line question

I recall a thread that mentioned removing pex water line connections by heating them. I also searched and found one thread that made the same comment.

I'm pretty familiar with various types of plumbing fittings, including pex crimp connectors, but I've never encountered this type of line before that doesn't seem to require a crimp ring, a clamp or a twist and lock connector.

Can someone who has removed and re-installed this type of hose confirm that it can be heated and removed, then heated and re-installed and that it will shrink when cool and not require any sort of clamp.
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Old 03-12-2013, 06:23 AM   #2
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Originally Posted by Ron in BC View Post
I recall a thread that mentioned removing pex water line connections by heating them. I also searched and found one thread that made the same comment.

I'm pretty familiar with various types of plumbing fittings, including pex crimp connectors, but I've never encountered this type of line before that doesn't seem to require a crimp ring, a clamp or a twist and lock connector.

Can someone who has removed and re-installed this type of hose confirm that it can be heated and removed, then heated and re-installed and that it will shrink when cool and not require any sort of clamp.
Can't you just unscrew the black part? It almost looks like a compression style fitting to me, hard to tell.
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Old 03-12-2013, 07:39 AM   #3
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I know a little about that type of PEX fitting but have never heated one for reinst. The PEX and ring is expanded by mechanical means like a tail pipe expander. Once expanded the PEX is suppose to contract to its orig. diameter. The fittings are suppose to be oversize compared to the ones used with the compression rings so the PEX will have a tight fit. I don't think the fitting will work with the ring crimp tools, they might not even fit the pipe unless the pipe is expanded.
I looked at the fastning system but decided to go with the stainless ring clamping system. I just replace the fittings with crimp ring or gator fittings. If you use the gator type fitting make sure you use the pipe insert that comes with the fitting.
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Old 03-12-2013, 10:14 AM   #4
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The black part looks like the connector to your water pump. That's probably not something you can buy at a store since it comes with the unit. I've never heard of heating a PEX connector and maybe it's the light, but are you sure that hose really is PEX? And that blue thing doesn't look like anything I've seen on a PEX pipe. If it's only a couple connectors, by far the easiest thing to do is to use Sharkbites. They're available at Home Depot.
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Old 03-12-2013, 10:15 AM   #5
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Do you want to remove the fiting from the line? Just unscrewing the black collar will disconnect it from the water pump.

If you do have to remove the fitting, and don't want to buy the crimping tool, get a "Flare-It" brand connector. They use a barb and a compression nut connection to lock onto PEX or poly tubing.
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Old 03-12-2013, 02:07 PM   #6
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Thanks for the info.

What I want to do is cut the line a few inches from the pump and install a tee. But I didn't want to cut the line and then have a problem finding suitable fittings. It sounds like a shark bite fitting is the way to go.

Thanks
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Old 03-12-2013, 03:13 PM   #7
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yes, using a gator or sharkbite fitting will work fine for adding a T to your line. The blue fitting on the current line is a 'press-fit clamp and takes a special tool to install. The sharkbites eliminate the need for the special tool. I have used them both on pex and copper with no leaks or problems.
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Old 03-12-2013, 03:36 PM   #8
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That's not PEX, it's some other type of plastic. The distinction may be important when buying fittings.

Here's an excellent short video on the subject of repairs to that kind of line.

RV Water Lines - YouTube

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Old 03-12-2013, 06:53 PM   #9
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All you want to know about PEX fittings.
Videos - PexSupply.com
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Old 03-12-2013, 07:21 PM   #10
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Originally Posted by Terry G View Post
The black part looks like the connector to your water pump. That's probably not something you can buy at a store since it comes with the unit.
Hummm you may have a good point Terry. In the photo of the pumps that Scamp sells in their parts store they actually appear to come with a blue fitting that goes with them as well.
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Old 03-12-2013, 07:22 PM   #11
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Originally Posted by Terry G View Post
The black part looks like the connector to your water pump. That's probably not something you can buy at a store since it comes with the unit.
While not common, and probably specific to RVs, those screw-on fittings for water pumps are available in at least some of our local RV shops - I have purchased them (in a form with hose barbs - probably what is in the photo) from a local retail RV parts and repair business.

It looks like a replacement connector may not be needed in this case.
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Old 03-12-2013, 07:23 PM   #12
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Sharkbite Connectors

Quote:
Originally Posted by Terry G View Post
The black part looks like the connector to your water pump. That's probably not something you can buy at a store since it comes with the unit. I've never heard of heating a PEX connector and maybe it's the light, but are you sure that hose really is PEX? And that blue thing doesn't look like anything I've seen on a PEX pipe. If it's only a couple connectors, by far the easiest thing to do is to use Sharkbites. They're available at Home Depot.
I second the Sharkbites They are not cheap for the SS variety but they work great , they don't leak , are easy to install especially in tight spaces , approved for concealed locations and I have never seen the tube pull out of the fitting if installed correctly
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Old 03-12-2013, 07:27 PM   #13
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Originally Posted by Ron in BC View Post
What I want to do is cut the line a few inches from the pump and install a tee.
The installation instructions for common pumps - at least from Shurflo - call for flexible hose for the sections directly connected to the pump. Harder line transmits too much pump noise. This change could be used as an opportunity to quiet down the installation by using hose from the pump to the new tee.
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Old 03-12-2013, 09:59 PM   #14
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Excellent links, showed me everything that I didn't know about pex including the expansion type used by Scamp. Since I won't be buying one of those power expansion tools and because the pex people even have manifolds using SharkBite connectors, which seems to be a pretty good endorsement of them, SharkBites it is.

Re: flex section to reduce noise from the pump. Good idea, I'm going to rubber mount it and install an accumulator tank also.

Thanks all
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