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Old 05-06-2014, 07:54 PM   #1
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Fresh water system construction

I understand that PEX is used for construction. Are the joints "compression" or "sharkbite" fittings? I have been reading on other forums that the PEX lines and compression fittings can freeze and thaw without damage, but the sharkbite fittings fail.

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Old 05-06-2014, 08:08 PM   #2
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ETI uses the compression fittings for the very reasons you mention. Look at the recent posts on toilet leaking and you will see the picture I posted. It makes the toilet mod more difficult because most of us do not have the compression tool.
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Old 05-06-2014, 08:53 PM   #3
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Pex compression ( threaded 3 part) or crimp fittings for joints ?
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Old 05-06-2014, 09:35 PM   #4
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ETI uses the compression fittings for the very reasons you mention. Look at the recent posts on toilet leaking and you will see the picture I posted. It makes the toilet mod more difficult because most of us do not have the compression tool.
You can rent the pex compression/crimper tool at most of the building supply stores around here for about $10/day. I did that about 5 or 6 times before I eventually bought the tool for about $80. Pex is so easy to work with. Anyone with a minimum level of mechanical skills would have no problems at all.
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Old 05-06-2014, 11:49 PM   #5
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Originally Posted by yardsale View Post
I understand that PEX is used for construction. Are the joints "compression" or "sharkbite" fittings?
I think it's pretty rare to find the o-ring sealed fittings (such as Sharkbite) except in repairs and retrofits. Any factory installation (like original building construction) typically uses less expensive, less bulky, and more reliable connections with clamps over barbs (or in the case of some PEX connections now, the PEX is just stretched over a barb); compression fittings are a more expensive but solid option that is used mostly with valves or other fittings that may need to be changed later.

This looks like a decent explanation: PEX Information
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Old 05-07-2014, 02:53 PM   #6
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Good news from my perspective. To satisfy myself, I am going to purchase a small piece with a fitting, then fill with water and place in freezer. Results to follow. My fantasy is that simply draining the fresh water lines will suffice when we plan on being away from the trailer for 4 days at a time next winter.
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Old 05-07-2014, 05:42 PM   #7
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What is the best type of connection for a water shut valve in the trailer. I want to add a shut off valve for the toilet?
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Old 05-07-2014, 05:46 PM   #8
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What is the best type of connection for a water shut valve in the trailer. I want to add a shut off valve for the toilet?
I would use crimp connectors with an inline ball valve.
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Old 05-07-2014, 08:01 PM   #9
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Thanks Jim!
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