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Continue to ChatASCO SCS353A731.230/50 - Orifice Size 40mm, Quick Mount On Inlet & Outlet, Series 353 - ASCO Dust Collector Power Pulse Valves https://www.valves-direct.com/product/asco-scs353a731-230-50-orifice-size-40mm-quick-mount-on-inlet-outlet-series-353-asco-dust-collector-power-pulse-valves/