Regicocraft Dust Collecting Plastic Blast Gate with Mount #00662 #00972 #00973Wall mount flange molded on blast gate fitting to shut off one dust collection line at a time Simple open or shut design has flat, square plate that moves inside a 3 sided frame Overall dimensions: 6 1 2" x 5 1 2" closed and 10 1 4" x 5 1 2" in open position Each 4" OD port is 1 1 2" long to provide room to slide on hose and apply hose clamps Molded using ABS material for rigidity and durability