.187 vs .270 T Seal Measurement

A quick learner from Sandpoint, ID says:
How do we measure to determine if we need .187 or 270 Tseal?
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Casey from SWISCO responded:

Those measurements describe the tab width that will fit into the kerf or groove of your window or door.

.187
.27
You could measure the size of your groove to see which seal would be a better fit.
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