The GRACO 277358 is a piston seal repair kit made from UHMWPE (Ultra-High Molecular Weight Polyethylene), designed for use in GRACO pump assemblies to restore sealing performance and prevent leaks in high-pressure fluid handling systems.

Key Features:

• Piston Seal Repair Kit
• 4 in.
• UHMWPE (Ultra-High Molecular Weight Polyethylene)
• For use with 2:1 and 3.5:1 Ratio NXT Pump Models: Jx20xx, Jx35xx; Viscount II 460 Models: 247355, 247356, 247357, 247358, 247359, 247360, 247361; also referenced for 1200 series Glutton pumps and certain 4-ball lowers (models 24J088, 24J089)
• High wear resistance due to UHMWPE material
• Designed for easy replacement and maintenance
• Reliable sealing for extended service life

Applications:
Used in GRACO pump assemblies for industrial, mining, and agricultural fluid handling systems to maintain pump efficiency and prevent leaks.

Installation Notes:

• Using genuine GRACO parts ensures proper fit, performance, and longevity of the equipment.
• Follow the specific pump assembly manual for correct installation procedures and torque specifications
• Lubricate throat packings and glands as recommended before installation
• Ensure all components are clean and free from debris before assembly
• Regularly inspect seals for wear and replace as needed
• Use only recommended lubricants and replacement parts
• Refer to the equipment manual for detailed maintenance schedules