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Thread: Frod compression fittings concerns

  1. #1
    DIY Junior Member C.bunk's Avatar
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    Question Frod compression fittings concerns

    Do Ford quick connect compression fittings work with 3/4 PEP (iron pipe size) or just with PET (copper tube size)?

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    Moderator & Master Plumber hj's Avatar
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    If we are referring to the same item, it is for copper tubing and other materials with the same o.d. dimensions, not IPS dimensions.
    Licensed residential and commercial plumber

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    DIY Junior Member C.bunk's Avatar
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    The catalog on fordmeterbox.com shows a quick connect (how it works) diagram in small print it says it is designed for copper and cts, but then in their parts list it shows an asteric next to the 3/4 P.E.P.x 3/4 f.I.p. (And says also available in quick connect (which in their own fine print says quick connect fittings are designed for cts). A little confusing! I'm hoping the supply house sold me the correct size. The Difference between the o.d.'s for 1"CTS and 3/4PEP (iron pipe size) only about 1/16" I used the fitting and tested it and buried it it's been two days and holding.

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    Plumber jimbo's Avatar
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    I think you are mixing things up. PEP is polyethylene pipe, NOT iron pipe. So you have to be careful to get the fitting for what you are using. I don't know for sure how much tolerance there is on a pack joint. I would recommend getting one spec'd for the pipe you are using.

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    DIY Junior Member C.bunk's Avatar
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    I understand that PEP is plastic pipe and not iron pipe but PEP's "control" for sizing is iron pipe size. (example: 3/4 PEP has the same I.D. as 3/4 Iron pipe.) I think were just misunderstanding each other. As far as this relates to the original concern, I think the supply house may have sold me a quick joint compression coupling for 1" cts and I used it on 3/4 PEP. The O.D. For 1" cts is about 1/16 larger than the O.D. For 3/4 PEP. I'm concerned that that extra 1/16 difference may not allow the compression joint to "compress" the stainless steel ring and rubber gasket hard enough to keep the pipe from pulling out.

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    Moderator & Master Plumber hj's Avatar
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    quote;example: 3/4 PEP has the same I.D. as 3/4 Iron pipe

    You are the one who is confused. I.D. has NOTHING to do with being cts or ips. The O.D. is the determining factor. In fact, keeping the copper tubing I.D. constant is the reason the O.D.s are different, because of the variation in pipe wall thickness. Plastic pipe, for a given size, however, will have a smaller I.D. because the pipe has a thicker wall, but the O.D. will remain constant. If the fitting is 1/16" too large, the components, especially the stainless steel ring, will not tighten properly.
    Last edited by hj; 01-23-2012 at 04:43 AM.
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    Plumber jimbo's Avatar
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    And a fitting for poly needs to use a stiffener insert. Get the fitting for the type of pipe you have. It's not that hard!

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    DIY Junior Member C.bunk's Avatar
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    Your right I was confused. I was talking about copper pipe size (not copper tubing) having the same outside diameter as cts poly. Also I.P. Having the same I.D. As PEP. Any way the reason I was so worried was because it was in the ground and buried in 4 ft of dirt. but I went back to the supply house and had them reprint my invoice it was the right fitting. So ---- it I'm done with this blog. Thanks for your input.

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