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Split Flanges/Escutcheons - how to measure?

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Joejoyce
Joejoyce Member Posts: 1
in THE MAIN WALL
ok, I am baffled about how to accurately measure my radiator pipes (steel or iron) and buy the correct split flanges. Two parts to this question:

1. I measured my larger pipes and they are 1 3/4'; the split flange that fit stated it was 1 1/4". So those are complete.

2. Smaller pipes measure 1 1/4" - but I can't find the right size flange to fit. If I use the proportions in #1 above, the size would be 3/4" flange, but that is too small. One online plumbing place suggests 1 5/8" flange but that seems counter intuitive to the proportions in #1.

Any ideas on what size I should use to get #2 properly fitted?

Thanks, Joe Boston MA

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  • delcrossv
    delcrossv Member Posts: 742
    edited December 2021
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    It'd be a escutcheon for 1 inch pipe.

    SCH 40 Pipe-1 1 in pipe size 1.315 in OD
    Trying to squeeze the best out of a Weil-McLain JB-5 running a 1912 1 pipe system.
  • HomerJSmith
    HomerJSmith Member Posts: 2,441
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    Yes, it is kinda of confusing. Flanges come in two flavors, copper size and Iron Pipe Size. IPS fits Iron pipe.

    1" iron pipe has an overall dimension 1-1/4". 1" copper pipe has an overall dimension of 1-1/8". 1-1/2" ABS has an overall dimension of 2". It has to do with wall dimensions.

    Ordering 1" IPS flange will have a 1-1/4" hole.

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