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Continue to ChatAVENTICS - R422001397 - Compact cylinder ISO 21287, Series CCI (CCI-SA-050-0005-002122411000020000000000) https://www.valves-direct.com/product/aventics-r422001397-compact-cylinder-iso-21287-series-cci-cci-sa-050-0005-002122411000020000000000/