Graco 104890 Pin Diffuser – Precision Flow & Atomization Component
Compatible Machines
- Graco high‑pressure airless spray guns and pumps
- Graco industrial coating rigs with fluid diffusion modules
- Graco mobile finishing systems requiring consistent atomization
- Graco equipment where pin‑diffuser style components are listed in service parts
Product Description
The Graco 104890 Pin Diffuser is a finely‑machined component designed to optimise fluid flow and atomization inside high‑pressure spray equipment. It ensures uniform distribution of paint or coating material, mitigates clogging under demanding conditions, and supports consistent spray performance across variable viscosities.
Key Features
- Compact pin‑diffuser structure: Designed for precise fluid channeling and controlled shear of coating material.
- Durable construction: Machined from robust alloy or stainless material to withstand abrasion and high pressure.
- Optimised for atomization: Helps maintain consistent spray pattern and finish quality under industrial conditions.
- OEM part: Ensures exact fit and performance in Graco systems, enabling reliable replacement.
- Service friendly: Simplifies maintenance — replacing the diffuser can restore flow performance and reduce downtime.
Technical Specifications
| Specification |
Details |
| Part Number |
104890 |
| Component Type |
Pin Diffuser / Flow Distribution Element |
| Intended Use |
High‑pressure spray/paint systems for fluid distribution and atomization |
| Material |
Wear‑resistant metal alloy or stainless steel (industrial grade) |
| Service Environment |
Industrial finishing, coatings, airless spray systems |
Applications
The 104890 Pin Diffuser is used in spray systems where control of fluid flow, minimisation of shear damage, and consistent atomization are critical. It aids in achieving uniform coating finishes in applications such as automotive, industrial machinery, and large‑scale finishing environments.
Performance Advantages
- Enables smooth, consistent spray patterns by stabilising fluid flow.
- Reduces risk of clogging or flow disruption by maintaining integrity of internal flow channels.
- Supports longevity of downstream components by managing shear and fluid velocity.
- Improves finish quality and reduces material waste by optimising atomization.
- OEM compatibility ensures correct fit and helps maintain system reliability.
Maintenance Tips
Inspect the pin diffuser during routine maintenance: check for fouling, abrasion, or deformation of the diffuser pin and channels. Clean any build‑up of coating materials, replace the diffuser if wear is evident or flow patterns become inconsistent. Ensure correct seating, use appropriate torque if fastened, and confirm spray performance resets to specification after installation.
Frequently Asked Questions
It acts as a flow‑modulating and distribution element within a spray system, optimising fluid passage and atomization for consistent output.
Replace it when you notice spray pattern degradation, pressure fluctuations, increased material waste, or visible wear and damage of the diffuser pin or surrounding assembly.
While the part may physically fit other equipment with matching dimensions, using the OEM specified part ensures precise fit, correct material properties and reliable performance—especially under industrial conditions.
Ensure the system is depressurized, remove the old diffuser, clean the mounting surface, install the new 104890 part according to the service manual torque and alignment, and then test spray performance to verify correct operation.
