Kaufhof KWY112 4 Inch Right Hand Threaded / Quick Connect Splicer For Wood Shop Dust Collection Replaces Big Horn 11416 Outer Diameter: 4 inch Length: 4.25 inch Right hand Threaded splicer Connects to a 4 inch dust collection hose, Use the KWY136 for Left hand Easy to remove the tapered end from a "T", "Y", elbow or blast gate