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Continue to ChatEMERSON AVENTICS G651AR002Q117H0 - G1/4, 0.5-10 Bar, Round Gauge, ATEX Zones 1-21, Series 651 Regulator https://www.valves-direct.com/product/aventics-g651ar002q117h0-g1-4-0-5-10-bar-round-gauge-atex-zones-1-21-series-651-regulator/