New factory Mazda OEM engine positive crankcase ventilation valve for Early NB Mazda Miata. Also known as the PCV valve. This is the valve that goes into the left side of the valve cover. This valve allows the built up gasses from the valve cover to be pulled into the intake manifold. The valve has a 90 degree bend on it which differs from the straight 90-97 and 01-05 PCV valve. Part number B541-13-890A. Fits 1999-2000. Does not fit 1990-1997 or 2001-2005.
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