SprayTech part 0278312 is a prime/spray hexagonal nut – a specialized fastening component used on the prime valve assembly of compatible SprayTech airless sprayers. It secures the prime knob or cam mechanism to the valve stem, ensuring reliable mode selection between SPRAY and PRIME positions. The hexagonal shape allows easy tightening with a standard wrench.
| Part Number | 0278312 |
|---|---|
| Part Description | Prime/Spray Hexagonal Nut |
| Brand | Titan |
| Fits |
SprayTech Airless EP2105, EP2205 |
| Condition | New |
The SprayTech 0278312 Prime/Spray Hexagonal Nut is a critical retaining component inside the prime valve assembly. It locks the prime knob, cam, or actuator to the valve stem, ensuring positive engagement when switching between SPRAY (pressure) and PRIME (pressure relief) modes. The hexagonal shape allows a wrench to hold or turn the nut during assembly or disassembly.
Over time, this nut can become lost, cross‑threaded, or loosened by vibration. A missing or damaged nut may cause the prime knob to detach, the cam to slip, or the valve to malfunction, leading to unsafe pressure conditions. Replacing the nut restores secure fastening and reliable mode switching.
| Component retention | Secures prime knob or cam to the valve stem |
|---|---|
| Thread engagement | Standard hex nut for reliable torque application |
| Vibration resistance | Prevents loosening during sprayer operation |
| Service access | Hex shape allows easy removal for maintenance |
| Missing nut | Nut lost during previous service or from vibration |
|---|---|
| Stripped threads | Nut spins without tightening or will not hold torque |
| Corrosion or damage | Rust, deformation, or cracked hex flats |
| Loose prime knob | Knob wobbles or detaches even after tightening |
SprayTech 0278312 is compatible with the following SprayTech airless sprayer models. Always verify fitment using the correct parts diagram for your exact machine.
| Brand / Model | Component |
|---|---|
| Airless EP2105 | Prime/spray hexagonal nut |
| Airless EP2205 | Prime/spray hexagonal nut |
When replacing the prime/spray hexagonal nut, inspect these associated components to ensure complete prime valve function.
The knob may be damaged if the nut was missing; check for cracks or stripped splines.
If the nut loosened, the cam may have shifted and worn prematurely.
Inspect for damage; a damaged stem requires valve assembly replacement.
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