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ST-66 Dual Chemical Metering Valve spraymart *Discharge valve reduces trapped pressureSuttner ST66 dual chemical metering valve. 0 to 10% draw rate Panel mount 5 8" hole Chemical flow can be metered and shut off remotely from the injector. With two inlets, it also allows switching from one solution to another. Simply turn the knob to the desired side and setting on the easy to read legend plate.