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(888) 312-8812 Login SignupFluid or air circuits sometimes need flow to move one way and stop from backing up, and the Mack Multi-Purpose Check Valve handles that simple but important job. The valve opens with allowed flow direction, then closes against reverse movement so the circuit does not bleed back where it should not. It can be a small part in the system, but its behavior affects pressure holding, response timing, and clean system operation. Service checks often turn toward a check valve after flow acts right in one moment and wrong in the next. The Mack 20940438 helps keep one-way movement in check without overcomplicating the circuit.
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