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Continue to ChatASCO SCDUS353A731 - Orifice Size 40mm, Quick Mount On Inlet & Outlet, ATEX Dust ll3D, Series 353 - ASCO Dust Collector Valves https://www.valves-direct.com/product/asco-scdus353a731-orifice-size-40mm-quick-mount-on-inlet-outlet-atex-dust-ll3d-series-353-asco-dust-collector-valves/