The PCV (positive crankcase ventilation) valve is part of the positive crankcase ventilation system, which reroutes crankcase blow-by to the intake manifold and back to the engine, where it's re-burned in the cylinders as part of the fuel/air mixture. This cuts emission pollution and increases fuel economy because unburned fuel in the blow-by is consumed the second time around. It also keeps the blow-by and water vapor from fouling the oil in the crankcase, thus reducing the formation of engine sludge.
I've always thought PCV valves are pretty much all the same. However, I think this one is better quality than the cheaper ones I've bought made in China. This is a Standard product and it is made in the USA. It costs a little bit more, but it's worth it to me.