OSK™ O-Ring Kit for use with Graco Fusion CS 256490 OEM Grade

The OSK™ O-Ring Kit for Graco Fusion CS 256490 is a complete equal to OEM-grade O-Ring repair kit engineered for superior sealing performance in spray foam and polyurea equipment. Designed to match the Graco Fusion CS specifications, this kit ensures precise sealing, extended equipment life, and reduced downtime by preventing leaks and maintaining consistent pressure performance.

Each O-Ring in this kit is manufactured to strict AS568 standards with premium elastomer compounds for durability and chemical compatibility in demanding spray environments. The kit’s components are matched to Graco OEM equivalents for direct replacement without size guessing or performance compromise.

Material & Performance Details

This OEM-grade OSK™ kit is built using high-performance sealing compounds selected for their resistance to:

• Hydraulic and synthetic oils
• Isocyanates and polyurea chemicals
• Solvents and moisture ingress

Each O-Ring delivers excellent compression set resistance, long service life, and reliable sealing under pulsed pressure conditions.
All materials are precision molded, batch-tested, and conform to industry standards for consistency and dimensional accuracy.

Excellent resistance to:

• Hydraulic oils and lubricants
• Polyurea and polyurethane spray chemicals
• Water and mild acids

Limited capability with:

• Ketones

Not compatible with:

• Strong acids or polar solvents

Kit Contents

Applications & Use Cases

Designed specifically for Graco Fusion CS spray guns, this O-Ring repair kit ensures reliable sealing in:

• Polyurea and polyurethane spray foam systems
• High-pressure proportioners and pumps
• Industrial coating and adhesive equipment
• Maintenance and rebuild applications for OEM-grade performance

Why Buy from The O-Ring Store LLC

The O-Ring Store LLC is your trusted source for precision sealing solutions.
Every OSK™ Kit is assembled in the USA and backed by ISO9001:2015-certified quality controls.

• USA stock for fast delivery
• Same-day shipping on in-stock items
• Custom and OEM rebuild kits available
• Full lot traceability and documentation on request
• Expert technical support and cross-reference guidance
• Competitive pricing with no compromise on quality