SprayTech part 0278304 is a prime spray knob – the external control handle that operates the prime / pressure relief valve on compatible SprayTech airless sprayers. Rotating the knob between SPRAY and PRIME positions directs paint flow to the gun or back to the hopper/drain, and allows safe system depressurization.
| Part Number | 0278304 |
|---|---|
| Part Description | Prime Spray Knob |
| Brand | Titan |
| Fits |
SprayTech Airless EP2105, EP2205 |
| Condition | New |
The SprayTech 0278304 Prime Spray Knob is the user‑operated handle that controls the prime / pressure relief valve on EP2105 and EP2205 airless sprayers. Turning the knob to the SPRAY position closes the relief valve, directing pressurized paint to the spray gun. Turning it to PRIME opens the relief valve, diverting paint back to the hopper (or suction tube) and depressurizing the system for safe tip changes and cleaning.
Over time, the knob can crack, strip its internal drive splines, or become loose on the valve stem. A damaged knob makes mode selection difficult or impossible, compromising safety and sprayer function. Replacing the knob restores positive control and clear tactile feedback.
| Mode selection | Turns the internal cam to switch between SPRAY and PRIME |
|---|---|
| Pressure control | Allows safe depressurization before tip changes or cleaning |
| Visual indication | Markings show current operating mode |
| Ergonomic grip | Finger‑friendly shape for easy turning, even with wet hands |
| Cracked or broken knob | Visible cracks, missing pieces, or separation from the metal insert |
|---|---|
| Stripped splines | Knob spins freely on the valve stem without moving the cam |
| Loose fit | Knob wobbles or can be pulled off without resistance |
| Worn indicator markings | Labels are illegible, causing mode confusion (safety issue) |
SprayTech 0278304 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 knob |
| Airless EP2205 | Prime spray knob |
When replacing the prime spray knob, inspect these associated components to ensure proper valve operation and safety.
The cam is driven by the knob; if the knob stripped, the cam may also be worn.
A bent or damaged stem can cause excessive resistance, leading to knob failure.
Missing hardware allows the knob to detach or wobble.
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