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The Spraying Systems 6815-1/2-300 Pressure Regulating Valve is a piston-type relief valve made with brass. It has a maximum pressure rating of 300 PSI and 1/2" inlet and outlet ports. This valve allows you to easily regulate flow in systems using centrifugal pumps with throttling valves. Its adjustable cap and lock ring provide simple valve control. Control line pressure and minimize liquid waste and return liquid back to the liquid source or pump inlet.