The 0551529 Fluid Section Assembly is a complete pump lower designed for use on the RentSpray 400 and SprayTech Airless Advantage EPX2155. This assembly draws, pressurizes, and delivers coating material to the spray system, restoring stable pressure and consistent spray performance when the original fluid section is worn or damaged.
| Part Number | 0551529 |
|---|---|
| Product Type | Fluid Section Assembly (Pump Lower) |
| Condition | New OEM |
| Includes Components | Complete fluid section housing Piston rod and displacement assembly Inlet and outlet valve components Packings and seals (pre-installed) |
| Fits | RentSpray 400; SprayTech Airless Advantage EPX2155 |
The 0551529 Fluid Section Assembly is an OEM pump lower used on the RentSpray 400 and SprayTech Airless Advantage EPX2155 airless sprayers. It contains the critical internal components required to generate pressure and deliver a steady flow of material to the spray hose and gun.
As packings, valves, and wear surfaces degrade, sprayers may experience pressure loss, surging, or material bypass. Installing a complete fluid section assembly restores original operating characteristics without the downtime of rebuilding individual parts.
| Material pressurization | Generates high pressure required for airless spraying |
|---|---|
| One-way flow control | Uses inlet and outlet valves to regulate fluid movement |
| Consistent output | Maintains steady flow for uniform spray application |
| Pressure loss | Sprayer cannot maintain operating pressure |
|---|---|
| Surging or pulsing | Uneven spray caused by internal wear |
| Material bypass | Paint leaking past packings into the wet cup |
| High service time | Repeated rebuilds no longer restore performance |
Part 0551529 is compatible with the following airless sprayers. Always confirm fitment using the correct parts diagram for your exact unit and revision.
| Sprayer Model | Component |
|---|---|
| RentSpray 400 | Fluid Section Assembly (0551529) |
| SprayTech Airless Advantage EPX2155 | Fluid Section Assembly (0551529) |
Used for preventive maintenance or partial rebuilds.
Restore prime retention and pressure stability.
Restricted inlets can mimic fluid section failure symptoms.
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