The GRACO 115666 is a U-cup packing made from Viton, designed to provide a reliable seal in GRACO diaphragm pumps and similar equipment. Its primary function is to prevent leakage and ensure efficient operation of the pump by sealing the actuator piston or shaft.

Key Features:

• Packing, U-Cup
• Viton (fluoropolymer elastomer)
• GRACO diaphragm pumps and compatible equipment
• High chemical resistance due to Viton material
• Reliable sealing performance
• Ease of maintenance and replacement
• Designed for long service life in demanding environments

Applications:
Used in GRACO air-operated diaphragm pumps and similar equipment to seal actuator pistons or shafts, preventing fluid leakage and maintaining pump efficiency.

Installation Notes:

• Using genuine GRACO parts ensures optimal performance, reliability, and safety of the equipment. Non-genuine parts may compromise seal integrity and equipment lifespan.
• Ensure the lips of the U-cup packing face the correct direction (typically toward the narrow end of the piston or out of the housing, as specified in the manual)
• Lubricate the U-cup packing before installation to facilitate proper seating and reduce wear
• Inspect the packing and surrounding components for damage or wear during replacement
• Follow the manufacturer’s torque specifications and assembly procedures for reassembly
• Regularly inspect U-cup packings for wear or damage
• Replace packings at recommended intervals or when leaks are detected
• Use only compatible lubricants and replacement parts