For the most part, adapters are versatile, allowing very dissimilar fixed ports to play well together. Unfortunately, sometimes adapters are inconvenient. They can be heavy, clumsy, or insecure. In this case, all 3 maladies elicited a custom dust shroud for the Kreg Pocket Hole Master System ensuing in a lightweight and secure direct connection to my Festool CT dust extractor 27 mm hose.
For a short video of why this came to be, check out the full blog post at http://tool-torials.com/027-festool-kreg-dust-shroud/
Both left (pictured) and right port options available. Print with open side facing up to reduce build time and support material.