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Continue to ChatEMERSON ASCO 54391027 - Series 543, 5/2 Way Spool Valve, Solenoid Air Operated Return, ISO 3 - OBSOLETE - REPLACED BY AVENTICS 5813720720 https://www.concretespares.ie/product/asco-5-2-pneumatic-control-valve-pilot-pilot-iso-3-g3-4/