Each PCV valve is a direct-fit replacement that replaces OE damaged units to provide precise air flow from the crankcase to the intake manifold. Every PCV valve is constructed with high grade industrial material to resist oil and high engine operating temperatures. Each PCV valve is manufactured with a spring-loaded valve and a sliding pintle inside allowing a precise air flow adjustment to OE specifications resulting in an optimal engine performance. All of our PCV valves are manufactured and tested to fit, form, and function to 100% OE quality.