The GRACO 128779 is a blue Vee packing, typically made from a durable polymer such as UHMWPE (Ultra High Molecular Weight Polyethylene), designed to provide a reliable seal in GRACO pump assemblies. Its primary function is to prevent fluid leakage and maintain pressure integrity within the pump system.

Key Features:

• Vee Packing
• Polymer (likely UHMWPE, blue)
• Designed for reliable sealing in high-pressure environments
• Ease of maintenance and replacement
• Durable construction for extended service life

Applications:
Used in GRACO pump assemblies to seal pistons and prevent fluid leakage, suitable for industrial, agricultural, and maintenance applications where reliable pump performance is required.

Installation Notes:

• Using genuine GRACO parts ensures optimal performance, longevity, and safety of the equipment.
• Ensure the pump is depressurized and isolated before replacing packing
• Clean the packing gland and piston surfaces thoroughly before installation
• Follow manufacturer-recommended torque settings for gland nuts (if applicable)
• Inspect for wear and replace packing as part of regular maintenance
• Regularly inspect packing for signs of wear or leakage
• Replace packing at recommended intervals or when performance issues arise
• Use only genuine GRACO parts for best results