These control the volume of flow in the power steering system. One is a 1.3 GPM, and the other is a 2.0 GPM. These valves reduce the flow volume but don't change the pressure. Reducing the flow volume can reduce the twitchy feeling in some pump/box combinations to provide a more comfortable driving experience.
Fits GMP series pumps. Metric O-ring hose application.
NOTE: The 1.3 GPM valve is also compatible with rack and pinion setups in many hotrod applications.
Fit
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