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ARO-STOP® shut-off valves are designed to prevent pump "runaway". Pump runaway occurs when the material container is depleted, causing the pump to cycle fast and needlessly. The ARO-STOP® valve protects the pump by shutting off the air supply when the material container is empty or a fluid line on the outlet side of the pump is broken. Use with oil or grease pumps.

Shuts off air to pump when material container is empty or fluid line is broken. Air inlet and outlet 1/2"(F).