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Thread: Plastic Tubing Compression Fittings

  1. #1

    Default Plastic Tubing Compression Fittings

    I'm trying to install a waterline to my new fridge for the icemaker, I'm using 1/4" OD plastic tubing, I am trying to use compression nuts but can't get a seal. I installed a valve into my pex pipe with no problems. I'm using a brass nut with brass sleeve, any help would be great

  2. #2

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    You need a 1/4" nuts, ferrules, and inserts. Without inserts, you won't get a good seal.

  3. #3

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    I have the nuts and inserts, the guy at the store said i did not need the ferrule

  4. #4

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    The ferrule is the "sleeve" that forms the seal when the nut compresses it. The insert keeps the sleeve from deforming the tube. You must have all three to make a good seal!!!

  5. #5

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    Thanks, I just checked the nuts I had and they have the ferule built in to the nut, but I still can;t get get a seal

  6. #6

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    Get all 3 separate pieces and you'll be fine.

  7. #7
    DIY Member JohnD's Avatar
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    Try using a plastic ferrule instead of the brass. Don't know why but sometimes it just won't seal with the brass.

  8. #8
    Plumber jimbo's Avatar
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    I agree with johnd that the metal ferrules are less friendly with plastic. My real problem is that I have seen the ferrules actually cut into the tubing.

    Use the white delrin ferrule. You will need to get new nuts, since you cannot use the nut that has the pressed in brass ferrule.

    I don't know what length of run we are dealing with. I much prefer the premade braided stainless steel flex lines. In 1/4" icemaker size these are available in 12", 48", 72", 10' and 20' lengths.

  9. #9

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    Yeah, its about 20 feet but I can't find the braided stainless, thats great stuff, used it on my dishwasher. I'm in Canada does anyone know where to get a 20' length of the stainless

  10. #10

    Default Help again

    When using the plastic ferrule, do I need a plastic nut and a plastic insert as well?

  11. #11
    DIY Senior Member SteveW's Avatar
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    Have you thought about using 1/4" flexible copper? That would be my choice.

  12. #12
    In the Trades Gary Swart's Avatar
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    I wondered how long it would take for someone to point out that soft copper is the best choice for this job. Forget the inserts, ferrules, braided line, plastic line, plastic nuts, etc..

  13. #13
    In the Trades mattbee24's Avatar
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    Copper tube is not always the best route to go. That is just my opinion. If the water quality is low, 1/4 od copper tubing will plug easily. Also, if you are running off a reverse osmosis system, copper tubing is a no-no.

  14. #14

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    I also find copper to be too inflexible. When you need to make a sharp bend like the final bend into the frig fitting, it puts a lot of pressure on that union and it's difficult to get a good seal.

    I prefer the braided stainless as well.

  15. #15
    Rancher
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    Quote Originally Posted by mattbee24
    Also, if you are running off a reverse osmosis system, copper tubing is a no-no.
    Please expand on this, I was planning on filling my solar tank with RO'd water, what's it going to do to my copper pipes and solar panels?

    Rancher

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