Hi,
In our hardware store the “1 inch” pipe is measured as 33.7mm and not 33.4mm as indicated in the wf installation manual.
Will the Sky still fit on this 33.7mm pipe?
By the way, why is a 1 inch nominal pipe called this way?
I don’t think that 0.3mm is going to make a difference.
Tubing is measured by OUTside diameter, because it is intended for structural use. Pipe is measured by INside diameter, since it transports fluids and how much it can hold is more important. Hence, 1 inch pipe is really 1 3/8 inches in outside diameter. Something to impress your friends with at your next Trivial Pursuit party… 
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