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Why pipe indirect 1.25\" if fittings are 1\"?

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D107
D107 Member Posts: 1,944
in THE MAIN WALL
some installers have said, "fitting is only 1 inch; what's the point?"

Also is it standard to install a swing check (or flow check?) and a Hydrotrol on the supply and return of the indirect tank to prevent gravity circulation?

Thanks,

David
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