This may be a stupid question but the docs state
“You are looking for either 29.5mm, 30mm, or 32mm Outside Dimension steel tubes. In the U.S. and parts of Canada this will be 1” OD EMT Conduit.”
Isn’t that 1.25" OD EMT Conduit? 31.75mm?
I printed off one of each of the Y rail clips and took them with me to the hardware store just so I was sure. The 1" EMT at Lowes fits the 29.5 perfectly. I tried the 1.25" with the other size clips and it does not fit any of them at all. So, assuming you are in the US, 1" is the way to go I believe. Its what I picked up.
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Okay thanks so is it really 1" ID? 1" OD would be 25.4mm wouldn’t it?
Genius 
Emt is measured by id
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“In the U.S. and parts of Canada this will be 1” OD EMT Conduit.”
So this line from the docs should really just drop the OD bit.
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@vicious1 see one above.
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PRs have been put in for the docs to fix it
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She said it was all about the size of the pipe, errrr, conduit
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I thought so. 
Such small prints, you end up wasting very little material just to be sure.
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In the US, tubing like stainless steel tubing or DOM tubing used by the Primo is measured by the outside diameter. BUT conduit or pipe are measured by the inside diameter (as mentioned by Damian). So, 1" EMT will have an approximately 1" (25.4mm) inside diameter, but 29.5mm outside diameter.
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EMT “diameters” are nominal not specific in much the same way that 2x4 lumber is not actually 2"x4", if you want precise numbers, there are lots of charts online that will give that to you, here’s one of them: https://www.engineeringtoolbox.com/conduit-size-d_1738.html
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