SprayTech part 0278240 is a diaphragm assembly used in the fluid pump or pressure regulator of compatible AirCoat and SprayTech airless sprayers. This assembly includes the flexible diaphragm and sealing elements that separate the fluid chamber from the air or control side, enabling precise pressure regulation or material delivery. A torn, stretched, or leaking diaphragm causes pressure loss, erratic spray, or fluid contamination. Replacing the assembly restores proper sealing and reliable performance.
| Part Number | 0278240 |
|---|---|
| Part Description | Diaphragm Assembly |
| Brand | SprayTech |
| Fits |
|
| Condition | New |
The SprayTech 0278240 Diaphragm Assembly is a genuine OEM replacement unit designed for AirCoat (models 0508074 and 0508074A) and SprayTech ED655 Plus sprayers. The diaphragm assembly is a critical component in pressure‑actuated valves, regulators, or transfer pumps, providing a flexible seal that responds to pressure changes.
Over time, diaphragms can become brittle, tear, or lose flexibility due to chemical exposure, fatigue, or normal wear. A failed diaphragm causes pressure loss, erratic output, fluid leakage into the air side, or complete pump failure. Replacing the assembly with OEM SprayTech 0278240 restores proper sealing, consistent pressure, and reliable material flow.
| Pressure regulation | Converts pressure signal into mechanical movement |
|---|---|
| Fluid isolation | Separates fluid from air or control chambers |
| Leak prevention | Prevents fluid bypass or cross‑contamination |
| Consistent output | Maintains steady material flow and pressure |
| Pressure loss / surging | Unable to maintain steady pressure |
|---|---|
| Fluid in air lines | Material leaks past diaphragm into control side |
| Visible damage | Tears, cracks, or permanent deformation |
| Age / hardening | Diaphragm has become stiff or brittle |
SprayTech part 0278240 is a direct OEM replacement diaphragm assembly for the following models. Always verify with your machine's parts diagram.
| Model | Component |
|---|---|
| AirCoat (Model No 0508074) | Diaphragm assembly |
| AirCoat NEW (Model No 0508074A) | Diaphragm assembly |
| SprayTech ED655 Plus | Diaphragm assembly |
When replacing the diaphragm assembly, inspect these associated components.
Check for cracks or warping that could affect sealing.
Corroded or missing hardware should be replaced.
Replace any peripheral seals at the same time.
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