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Continue to ChatASCO SCDUG353A051 - G2 1/2, Orifice Size 66mm, Threaded, Aluminium Body, ATEX, NBR, Series 353 ASCO Dust Collector Dual Pulse Valves https://www.valves-direct.com/product/asco-scdug353a051-g2-1-2-orifice-size-66mm-threaded-aluminium-body-atex-nbr-series-353-asco-dust-collector-dual-pulse-valves/