Check the listing for details. WOODRIVER Dust Connection 4" Tapered OD 4" Threaded Blast Gate. Condition: New. Listed at 22.18 USD. WOODRIVER Dust Connection 4" Tapered OD 4" Threaded Blast Gate, 164297, Blast gate shut-off one branch of your central dust collection system, Open or shut design has square plate that moves inside a 3-sided frame, 4" reverse threaded port fits securely inside most 4" dust collection hose, 4" O.D. tapered port slides inside most 4" dust collection hose, This WoodRiver® Threaded Blast Gate Fitting allows you to close one branch of your central dust collection system while you are using the other. Simple open or shut design has flat, square plate that moves inside a 3-sided frame to provide a pass-through or shut-off to connect your dust collector to your system or a branch line to one of your tools. Molded fitting has overall dimensions of 7-1/2" long and 6-1/2" wide closed; 12" long and.