The GRACO 555664 is a replacement O-ring made from Buna-N (Nitrile) rubber with a 70 durometer hardness. It is designed to provide a reliable seal in various GRACO fluid handling equipment, helping to prevent leaks and maintain system integrity.

Key Features:

• O-ring
• -228 (specific size designation)
• Buna-N (Nitrile) rubber, 70 durometer
• Designed for use in GRACO equipment requiring O-ring part number 555664 or -228 Buna-N 70 durometer
• Durable Buna-N material for chemical resistance
• 70 durometer for balance of flexibility and strength
• Reliable sealing performance

Applications:
Used as a sealing component in GRACO pumps, sprayers, and other fluid handling equipment where a -228 size Buna-N O-ring is required.

Installation Notes:

• Using genuine GRACO O-rings ensures proper fit, seal integrity, and equipment longevity.
• Inspect O-ring for damage before installation
• Lubricate O-ring with compatible lubricant if recommended by equipment manual
• Ensure O-ring is seated properly in its groove
• Avoid twisting or stretching the O-ring during installation
• Regularly inspect O-rings for wear or damage
• Replace O-rings during routine maintenance or if leaks are detected
• Use only compatible lubricants and replacement parts