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Continue to ChatASCO SCDUS353A811 24/DC - Orifice Size 20mm, Quick Mount On Inlet, ATEX Dust ll3D, Series 353 - ASCO Dust Collector Power Pulse Valves https://www.valves-direct.com/product/asco-scdus353a811-24-dc-orifice-size-20mm-quick-mount-on-inlet-atex-dust-ll3d-series-353-asco-dust-collector-power-pulse-valves/