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This Grax 24Y430 catalyst valve stack is designed for ProMix 316 systems, handling one clear and one flush material. It serves as the acid-side stack and is compatible with rebuild kit 26A187, which includes the necessary O-rings, seat retainers, and manifold spacer (Refs. 702–709 in the parts diagram). This replacement part corresponds to the valve stack assembly referenced in the manual's exploded parts view.