Compare Maximum number of 4 items selected Comp Cams Fluoroelastomer (FPM) Valve Stem Oil Seal - 521-1 Part #: 521-1 Line: COM Comp Cams Fluoroelastomer (FPM) Valve Stem Oil Seal Manufacturer's Defect Warranty Material: Fluoroelastomer (FPM) Inside Diameter (in): 0.375 Inch