- Buyer's Guide
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STH and STQ Ratio:Matic® Duplex pumps from Fluid Metering Inc. consist of two FMI valveless pump heads direct coupled to a single variable speed drive. The displacement of each pump is independently adjustable, and a variety of sizes can be used to achieve dispensing ratios from 1:1 up to 500:1. Each pump head is calibrated at the factory, but models are also available that can be adjusted in the field.