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Continue to ChatASCO WPDUG353A044 - G1, Orifice Size 27mm, Threaded, Aluminium Body, ATEX, NBR Seal, Series 353 - ASCO Dust Collector Pulse Valves https://www.valves-direct.com/product/asco-wpdug353a044-g1-orifice-size-27mm-threaded-aluminium-body-atex-nbr-seal-series-353-asco-dust-collector-pulse-valves/