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Continue to ChatASCO SCG353A051.230/50 - G2 1/2, Orifice Size 66mm, Threaded, Aluminium Body, NBR Seal, Series 353 Dust Collector Dual Pulse Valves https://www.valves-direct.com/product/asco-scg353a051-230-50-g2-1-2-orifice-size-66mm-threaded-aluminium-body-nbr-seal-series-353-dust-collector-dual-pulse-valves/