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8-1/4" wide
tapered male
This is called a jointer dust hood because it was originally made for a 6" jointer but it's very handy for collecting dust anywhere a hood this size fits. It's easy to cut to size as needed.
4" hose fits directly onto this fitting and needs to be hose clamped in place or you can use a quick adapters like #13411 and #13062 to allow you to move your hose to another machine - clamp free!