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The Giant Pumps 21905 is a pressure-actuated regulator designed for compatibility with any pump that fits within its flow rate and pressure range. Used to maintains system pressure. Features an adjustable knob that controls the amount of tension on a pressure spring. It also determines the direction of the flow in the system. When the flow stops, it is diverted through the outlet port and all flow is diverted to the bypass port at virtually no pressure. Requires a partial bypass to operate.
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