Dave Sr. from SWISCO responded:
April 24, 2017
Please start by looking at our 26-148 vent lock. I believe that Certainteed used one similar to this, but from what I remember it was a little larger. Compare your dimensions to ours to confirm that it matches. If not, you might need to use the after market 26-387. Take a look at the related video to see how it works.
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