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Graco 100065 Ball 3125

The Graco 100065 Ball (.3125) is a precision check ball used in pump and valve assemblies to maintain proper sealing and pressure control in Graco airless sprayers.

  • Part Number: 100065
  • Diameter: 0.3125" (5/16")
  • Function: Regulates and seals fluid flow
  • Fits: Graco 23:1 Monark, 433 EH GT

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Overview & Compatibility

Compatible Machines

This Graco 100065 Ball (.3125) is used in the fluid/valve sections of select Graco pumps and airless systems. Confirm with your unit’s parts manual before ordering.

  • Graco 23:1 Monark (selected configurations)
  • Graco 433 EH GT (selected configurations)

What is the Graco 100065 Ball (.3125)?

The 100065 is a precision check/valve ball with a nominal diameter of 0.3125 in (5/16"). It helps seal and regulate fluid flow within the pump or valve section, maintaining prime and stable spray pressure.

  • Function: Sealing element in fluid/valve assemblies (check-ball role)
  • Typical location: Fluid section / lower pump / valve seat
  • Use case: Restores sealing performance during pump rebuilds or valve service

Key Specifications

Attribute Detail
Part Number 100065
Description Ball, .3125 (check/valve ball for fluid section)
Diameter 0.3125 in (5/16")
Typical Assembly Pump/valve check assembly (with mating seat)
Fit Guidance Verify in the model-specific parts manual (by serial range)

Fitment & Replacement Tips

  • Match the ball to the seat specified for your pump or valve kit.
  • Inspect the seat for pitting/oval wear; replace if not sealing.
  • Keep components clean; any debris can prevent proper sealing.
  • After reassembly, prime the unit and check for pressure stability and leaks.

Frequently Asked Questions

Use your sprayer’s model number and serial range to check the official parts manual/diagram. Look for part 100065 in the fluid or valve assembly bill of materials before ordering.

Difficulty priming, pressure drop, pulsation at the gun, or paint bleeding back through the pump can indicate a worn ball/seat that no longer seals reliably.

It’s recommended to replace the ball and seat together if either shows wear. A new ball on a damaged seat may still leak and reduce pump performance.

.3125" (5/16") is the nominal diameter for part 100065. Only use this part where the manual explicitly calls for 100065 or a compatible kit containing it.

  • Depressurize and unplug/air-off the unit before service.
  • Work on a clean surface; avoid scratching the ball/seat.
  • Follow torque/order from the service manual and re-prime after assembly.

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