Porsche Outer Half Pulley Silver All 356s 912 Early 539 09 316 901 542 931 23 OEM •Cooler Temperatures To Reduce Brake 99755239801V04 •Cooler Temperatures To Reduce Brake Fade And Increase Disc And Pad Life •Reusable Hats For Lower Disc Replacement Costs •Full Floating 2 Piece Assemblies With Billet Aluminum Hats For Lighter Weight •Save Up To 16 Pounds Per Car In Un Sprung Weight To Improve Handling •Low Cost Direct Replacement For PCCB Equipped Cars The check valve will help to keep water from going back into the washer tank so the water will squirt out instantly from the washer jets No notches Porsche Silver finish outer half pulley for generator on all 356's and some early 912 models