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Continue to ChatASCO E909BB20MU1.3 - ASCO Dust Collector Sequencers - OBSOLETE AND REPLACED BY E909BB24MU1.5 https://www.valves-direct.com/product/asco-e909bb20mu1-3-number-of-valves-20-abs-housing-pc-cover-series-e909-asco-dust-collector-sequencers/