Slip-On Oil Fill & Cap 1-3/8in K9028

A quality oil fill cap is essential for maintaining proper engine sealing and preventing contamination—especially on custom or modified engine builds where factory caps don't fit. This slip-on design with O-ring seal delivers a secure, leak-free fit on 1-3/8in breather tubes, while the knurled aluminum cap provides positive grip and a finished appearance. Whether you're running a carbureted engine or dealing with aftermarket valve cover configurations, this universal adapter handles the job without modification.

• Slip-on design
• 1-3/8in tube diameter
• Screw-on cap mechanism
• Knurled aluminum construction
• O-ring seal included
• Push-on adapter tube
• Set screws for security
• Natural finish
• Sold individually