Check the listing for details. WOODRIVER Dust Connection 4" Wall Mount Basic Blast Gate for Dust Collection Sys. Condition: New. Listed at 23.98 USD. NEW, WOODRIVER Dust Connection 4" Wall Mount Basic Blast Gate for Dust Collection System, 162299, Wall mount flange molded on blast gate, ABS material, Each 4" OD port on either side of the gate is 1-1/2" long, Wall mount feature on this WoodRiver® Blast Gate Dust Collection Fitting provides a large, 6-1/2" x 3-1/4" flange with mounting holes to attach the fitting on the wall in either the horizontal or vertical direction. Common blast gate function 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.