Needle–Diffuser Seat Kit Details (Graco 218070)
The Graco 218070 Gun Needle-Diffuser Seat Kit restores proper sealing and spray performance in select Graco contractor-type airless spray guns by replacing the high-wear needle, diffuser/seat, and related seals.
Compatible Machines / Spray Guns
Fits the following Graco spray guns and assemblies (verify model & series on the gun ID plate):
- Contractor / FTx family guns (e.g., FTx, FTx-E, Contractor ST, SG2, SG3)
- 220955 (Contractor Gun with RAC IV) – Series D
- 235990 – Series C
- 217593 – Series E
- 820165 – Series D
- 244161 (Contractor In-Line Valve Gun)
- 244364
- 244365
- 238350 (FTX gun with RAC IV) – Series A
- 824004 – Series A
- 289385
- 287030
- Also commonly referenced with assemblies: 243285 (FTX with RAC V), 243282 (Contractor with RAC V), 824950 (Contractor with RAC V, SW).
Why Choose the Graco 218070 Kit
- OEM components restore shut-off and diffusion for a consistent spray pattern.
- Prevents leakage at the tip end by renewing the needle and diffuser/seat as a matched set.
- Maintains safety: proper diffuser function reduces high-pressure stream hazards when spraying without a tip.
- Designed for popular Contractor/FTx/SG-series Graco guns for quick, reliable service.
Kit Contents & Specs
| Kit Number | 218070 |
| Includes | Needle (assembly), Diffuser/Seat, Gasket, Locknut |
| Install Note | Replace needle and diffuser/seat together; mixing old/new parts can cause leaks. |
| Typical Torque* | Diffuser/seat assembly: ~26–32 ft-lb (35–43 N·m) |
| Supersedes | Commonly listed as replacing 177222, 107109 (check your model/series). |
Installation & Service Tips
- Perform a full Pressure Relief Procedure before disassembly.
- Remove tip/guard, then the old diffuser/seat and needle components.
- Clean mating surfaces; install new gasket and diffuser/seat, then the needle assembly.
- Tighten to spec; verify trigger shut-off and no seepage at the tip end.
- Test spray into a grounded metal pail; confirm proper diffusion without the tip installed.
Safety Notice: Airless equipment operates at very high pressure. Follow all Graco instructions to prevent injection injury. Use only genuine OEM parts like the Graco 218070 to maintain safety and performance.
Frequently Asked Questions
Yes—this kit is referenced for Contractor/FTx-family guns (including SG2/SG3) and for specific models listed above. Always confirm your gun’s exact model and series (e.g., 220955 Series D) before ordering.
These parts wear together. Using an old needle with a new seat (or vice-versa) can prevent proper sealing and cause leaks at the tip end. The Graco 218070 bundles them as a matched set to restore shut-off and diffusion.
Persistent dripping after releasing the trigger, difficulty achieving a clean fan pattern, or fluid jetting without proper diffusion (especially when the tip is removed) are common signs that the needle and diffuser/seat are worn.
Torque values can vary slightly by gun model/series. Use the typical range provided above as guidance, but always follow your specific Graco manual for final torque specifications and procedures.
Many catalogs list 177222 and 107109 as superseded by 218070. Still confirm against your gun’s parts list and series to ensure a correct match.
