Generic Buna-N O-Ring [4-3/4" ID] [1/8" CS] (O-439)

A Buna-N O-ring helps create a seal at a compatible large circular sealing point, and this generic version is sized with a 4-3/4 inch inside diameter and 1/8 inch cross-section using the O-439 reference. When an O-ring in this profile becomes worn or flattened, the assembly can lose the sealing support it should maintain across the connection.

The 1/8 inch cross-section gives this O-ring practical value because it offers a fuller profile than thin-section alternatives while still fitting many standard large-diameter grooves. A properly selected O-ring helps support cleaner fit and contributes to more dependable sealing performance.

This type of part is especially useful when the original application requires a large-diameter seal with a medium-profile section that should be matched closely during service. That helps keep repairs more accurate and more reliable.

Installed in the proper application, this O-ring helps support dependable sealing and contributes to cleaner overall assembly performance.

• Buna-N O-ring with 4-3/4 inch ID and 1/8 inch cross-section
• Helps support dependable sealing in larger compatible applications
• Useful when exact profile matching matters
• Supports cleaner targeted maintenance and repair
• Improves fit confidence and sealing reliability