Description of ACDelco 503 637 Professional Suspension Assembly
1-3/8 inch bore piston with sintered iron construction for durability and longer service life. Single lip oil seal for minimized friction. Super-finished chromed piston rod reduces corrosion, ensures proper seal lubrication, provides a consistent wear surface, and assists in longer product life. Precision engineered for top-of-the-line performance. Drawn over mandrel (DOM) pressure cylinder for high quality sealing properties and reduced internal friction to assist with longer product life.