

Part 0558377A is a complete fluid section assembly designed to deliver consistent pressure and reliable material flow in compatible airless paint sprayers. It houses the primary pumping components responsible for drawing, pressurizing, and delivering coating material.
| Part Number | 0558377A |
|---|---|
| Part Description | Fluid Section Assembly |
| Brand | Advantage |
| Fits | Advantage 600 |
| Condition | New |
The fluid section assembly is the core pumping component of the sprayer, responsible for drawing material from the supply, pressurizing it, and delivering it to the spray hose. Proper operation of the fluid section is essential for consistent pressure and smooth spray performance.
Wear to internal components such as packings, valves, or the piston rod can lead to pressure loss, pulsation, or material leakage. Replacing the fluid section assembly restores pumping efficiency and reduces downtime.
| Material pumping | Draws and pressurizes coating material for spraying |
|---|---|
| Pressure generation | Creates the operating pressure required for consistent output |
| Flow control | Supports smooth and even material delivery |
| Pressure loss | Unable to maintain steady spray pressure |
|---|---|
| Pulsation | Surging or uneven spray output |
| Material leakage | Fluid escaping past packings or seals |
| Internal wear | Scoring or damage to piston or valve components |
This fluid section assembly is compatible with the following airless paint sprayer. Always confirm fitment using the correct parts diagram for your specific model.
| Model | Component |
|---|---|
| Advantage 600 | Fluid section assembly |
Fluid section performance is often affected by multiple internal components. When servicing the fluid section assembly, these parts are commonly inspected or replaced at the same time.
Worn inlet valves can reduce prime and cause pressure instability.
Outlet valve wear can lead to pulsation and backflow.
Proper sealing is critical for maintaining pressure and preventing leaks.