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Continue to ChatEMERSON ASCO 54101019 - 5/2, ISO 1, Air Operated Pilot, Air Return, Series 541 Spool Valve - OBSOLETE - REPLACED BY AVENTICS 5811230000 https://www.concretespares.ie/product/asco-5-2-pneumatic-control-valve-pilot-pilot-iso-1-g1-4/