Oil pressure relief valve piston for Porsche 911 '74-'89 930 964 965 993 996 997

This piston is located in the left and right halves of the engine. To regulate the oil pressure, this piston is screwed into the engine block via a spring and a guide sleeve. In case of engine damage or severe wear, the old pistons can have scratches and negatively affect the oil pressure of the engine.