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Graco 25R645 Piston, 1/4"

OEM 1/4-inch piston engineered for Graco valve air cylinders, delivering reliable pneumatic actuation and consistent dispensing performance.

  • Genuine Graco part number 25R645
  • 1/4 in. air cylinder piston
  • Converts air pressure into valve movement
  • Compatible with select Graco iQ-T, iQ-B, and iQ-S valves

$128.5
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Air Cylinder Component Overview and Equipment Compatibility

Compatible Machines

Equipment Compatibility
Graco iQ-T Dispense Valve Compatible as the 1/4 in. air cylinder piston component
Graco iQ-B Dispense Valve Compatible as the 1/4 in. air cylinder piston component
Graco iQ-S Dispense Valve Compatible as the 1/4 in. air cylinder piston component
Graco 1-Component Sealant and Adhesive Dispensing Systems Used in compatible valve air sections utilizing the 1/4 in. air cylinder assembly

The Graco 25R645 Piston, 1/4" is a genuine OEM air cylinder piston designed for use within compatible Graco dispensing valve air sections. As a critical moving component, the piston converts pneumatic force into valve actuation, helping control material flow with precision and consistency.

Manufactured to Graco's original specifications, this 1/4-inch piston is engineered to provide reliable movement within the air cylinder assembly while supporting smooth valve operation. Replacing worn or damaged piston components helps maintain dispensing accuracy, responsiveness, and overall system performance.

Key Features

  • Genuine Graco OEM replacement piston.
  • Designed for 1/4-inch air cylinder assemblies.
  • Supports accurate pneumatic valve actuation.
  • Precision-machined for dependable operation.
  • Helps maintain consistent dispensing performance.

Applications

The 25R645 piston is used in Graco industrial dispensing systems handling sealants, adhesives, and other fluid materials. Installed within the valve air section, it plays a key role in pneumatic actuation and contributes to the reliable performance of automated and manual dispensing processes.

Frequently Asked Questions

The piston operates inside the air cylinder assembly, converting pneumatic pressure into mechanical movement that actuates the dispensing valve.

Yes. Part number 25R645 is a genuine Graco OEM replacement piston manufactured to original equipment specifications.

The piston is used in compatible Graco iQ-T, iQ-B, and iQ-S valve air section assemblies that utilize a 1/4-inch air cylinder configuration.

Replacement is recommended when wear, scoring, sticking, or reduced valve responsiveness affects dispensing performance and air cylinder operation.

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