When placing from content center the fittings default size selection should be the last used size, instead of defaulting to first item in the list every time. This way when you start placing fittings you only choose size first time, and the rest should follow. Different route? Different size? Then change size first placed item and the rest should follow again. I was going to suggest using the run size for each content center placed fitting but each run can have multiple routes each with its own size.
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