Graco 256470 O-Ring Kit - Aftermarket | Bedford 20-3118

Maintain reliable sealing in demanding coatings with this solvent-ready service set that replaces the OEM air-piston O-rings. Specified in Fusion CS documentation, it’s a practical option for shops that routinely overhaul proportioner guns and need consistent performance after cleaning or solvent exposure. Cross-referenced to Graco 256470 and supplied as Bedford 20-3118, the kit supports quick bench maintenance, helps reduce leaks, and contributes to smooth trigger response when the gun is assembled to spec and properly lubricated.

Aftermarket Solvent-Resistant Contractor Duty

Why Choose This O-Ring Kit

  • Formulated elastomers for resistance to common cleaning solvents used on plural-component gear.
  • Direct aftermarket alternative sized for the air-piston seal locations called out in manuals.
  • Supports responsive trigger action and helps minimize air leakage after routine rebuilds.

Tip: Lightly coat seals with manufacturer-approved grease before assembly to ease installation and extend service life.

Typical Compatibility

  • Graco Fusion CS spray gun (air-piston O-rings noted in parts lists).
  • Plural-component Reactor systems that specify this kit in their gun service sections.
  • Applications where manuals call the air piston O-ring kit by the OEM reference below.

Always match against your gun IPL and service bulletin for the exact seal locations.

What This Product Fits

  • Graco Fusion CS spray guns used on foam and polyurea proportioners (air-piston seal set).
  • Systems and gun assemblies where the parts catalog specifies kit 256470 for the air piston.
  • Service intervals following solvent cleaning procedures on Fusion CS equipment.

Verified fit references: Fusion CS gun listings and Graco parts literature identifying the air-piston O-ring kit under the OEM number below.

Technical Specifications

Aftermarket Bedford 20-3118
OEM Graco 256470 (also referenced as 256-470 in some documents)
FitsGraco Fusion CS spray guns and assemblies that specify the 256470 air-piston O-ring kit (verify IPL)
TypeSolvent-resistant O-ring set for air-piston sealing
MaterialSolvent-tolerant elastomer blend suitable for gun maintenance
FunctionSeals the gun air-piston stack to support smooth trigger and air flow control
PressureN/A for static seals (use system air settings per gun manual)
BrandBedford Precision Parts (Aftermarket)

Follow torque values and assembly order from the gun manual; replace worn pistons or sleeves if scoring is present.

Installation Notes

  1. Relieve system pressure; disconnect air and material lines and lock out the gun.
  2. Disassemble the air-piston section per the IPL, noting O-ring sizes and positions.
  3. Clean grooves with approved solvent; inspect mating surfaces for nicks or debris.
  4. Lubricate new O-rings lightly; install without twisting and seat evenly in each groove.
  5. Reassemble to spec and function-test the trigger and air shutoff for leaks.

Service Hint: Replace backup rings at the same time to maintain proper squeeze and extrusion resistance.

When to Rebuild / Replace

  • Air hiss around the piston cap after re-pressurizing the gun.
  • Sticky or delayed trigger response following cleaning.
  • Flattened, cut, or swollen O-rings observed during teardown.
  • Rebuild intervals reached per usage hours or maintenance log.

Bedford vs OEM Comparison

FeatureBedford Aftermarket (20-3118)OEM (Graco)
Fit & InterfaceSized for Fusion CS air-piston seal locationsFactory Graco air-piston O-ring kit
PerformanceSolvent-resistant elastomers; supports smooth trigger actionOEM-spec materials and performance
AvailabilityIf in stock, ships from Bedford Precision Parts in Bedford Hill, New York.Ships via Graco distribution
ValueCost-effective service optionOEM program

FAQs

Yes. It cross-references the OEM air-piston O-ring kit for Fusion CS assemblies where the parts list specifies the Graco number below.
Graco Fusion CS spray guns used on Reactor proportioner systems. Always confirm against your current gun IPL before ordering.
Yes. The kit is designed to tolerate common cleaning solvents encountered during routine gun maintenance.
Basic hand tools and non-marring picks are helpful. Avoid sharp metal picks that can nick grooves or damage new seals.
Availability varies by stock. When available, Bedford fulfills from Bedford Hill, NY; check the product page for current status.