Check the listing for details. WOODRIVER Dust Connection 4" Wall Mount ABS Self-Clean Blast Gate Fitting. Condition: New. Listed at 24.98 USD. NEW, WOODRIVER Dust Connection 4" Wall Mount ABS Self-Clean Blast Gate Fitting, 162300, Each 4" OD port on either side of the gate is 1-1/2" long, ABS material, Wall mount flange molded on blast gate, Wall mount feature on this WoodRiver® Self-Clearing 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. Self-clearing design has rectangular plate with opening on one end that moves inside a 2-sided frame to prevent clogging. Blast gate function provides a pass-through or shutoff to connect your dust collector to your central dust collection system or a branch line to one of your tools. Molded fitting has overall dimensions of 10-1/4" long and 5-1/2" wide in the open.