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Continue to ChatASCO SCDUS353A721 - Orifice Size 25mm, Quick Mount On Inlet & Oulet, ATEX Dust ll3D, Series 353 - ASCO Dust Collector Valves https://www.valves-direct.com/product/asco-scdus353a721-orifice-size-25mm-quick-mount-on-inlet-oulet-atex-dust-ll3d-series-353-asco-dust-collector-valves/