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This newly designed 5% adjustable pump will only work with the newer style Chemilizer motor that has brass inserts molded into the body to connect the top and bottom of the unit. Adjustable chemical pumps easily adapts to any existing Chemilizer medicator for use with cleaners, nutrients and medications. Features a durable Kynar housing and easy-to-use adjustments.Ratio (Percentage)| 1:20 (5%) – 1:64 (1.6%)