The 68-218 is a Piper OEM packing (seal/gasket) used between aircraft wheel halves and commonly referenced as an alternative to part number 757-434. This component forms a sealing barrier within the wheel assembly, helping to prevent the leakage of grease, contaminants, moisture, and other foreign materials that could affect wheel bearing performance and service life.

Installed between the mating surfaces of the wheel halves, the packing ensures proper sealing when the wheel assembly is bolted together. It plays an important role in maintaining the integrity of the wheel and bearing environment, particularly during taxi, takeoff, landing, and ground handling operations where wheels are exposed to vibration, moisture, dust, and temperature variations.

The packing is typically manufactured from aviation-grade gasket or elastomeric sealing material selected for compatibility with wheel bearing lubricants and resistance to compression set over time. Proper installation is essential to achieve an effective seal and prevent contamination of internal wheel components.

Although small and inexpensive, this packing is an important maintenance item often replaced whenever the wheel assembly is disassembled for tire, tube, or bearing servicing.

Key features include:

Piper 68-218 wheel half packing (OEM sealing component)
Alternative/replacement for part number 757-434
Installed between aircraft wheel halves
Helps prevent grease leakage and contaminant ingress
Maintains integrity of wheel bearing environment
Compatible with aviation wheel bearing lubricants
Manufactured from durable gasket/sealing material
Designed for repeated loading and temperature variation
Commonly replaced during wheel and tire maintenance
Direct replacement part per Piper IPC specifications and approved maintenance practices