The GRACO 557439 is a replacement rupture disk designed for use in GRACO lubrication systems. It is a safety component intended to protect equipment by rupturing at a set pressure, thereby preventing overpressure damage. The disk is purple in color and is typically made from a durable material suitable for high-pressure applications, though the specific material is not specified in available sources. Its primary function is to act as a pressure relief device within GRACO divider valves and lubrication systems.

Key Features:

• Rupture Disk
• 11/16 in (0.688 in)
• 3250 psi (224 bar)
• For use with MJ, MSP, MHH, and MXP Divider Valves
• Acts as a safety device to prevent overpressure
• Easy to replace
• Color-coded for quick identification (purple)
• Reliable performance in high-pressure environments

Applications:
Used in GRACO lubrication systems as a safety device to protect against overpressure, particularly in conjunction with MJ, MSP, MHH, and MXP Divider Valves.

Installation Notes:

• Using genuine GRACO replacement parts ensures proper fit, function, and safety within the lubrication system.
• Always replace the rupture disk after it has ruptured or as part of routine maintenance
• Ensure the system is depressurized before installation
• Check for correct size and pressure rating before installation
• Follow all safety guidelines and manufacturer recommendations
• Regularly inspect rupture disks for signs of wear or damage
• Replace rupture disks at recommended intervals or after any overpressure event
• Keep spare rupture disks on hand for quick replacement