Paul from SWISCO responded:
December 15, 2009
The inside dimension including the tabs measures 1-9/16" and without the tabs measures 1-1/2". Take a look at the attached image of the 26-348 which shows the two measurements to help make it clear what is being measured. The image is from the underside of the 26-348 weep hole cover for a better view of the tabs.
Alternate view of 26-348
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