0533559 O-ring, Regulator, 423 is a genuine OEM replacement seal for Titan AirCoat sprayers. This O‑ring seals the regulator stem or adjustment mechanism, preventing fluid leaks and ensuring accurate pressure control. A worn, hardened, or cracked O‑ring can cause fluid seepage around the adjustment knob, pressure instability, or loss of regulation. Replacing the O‑ring restores a leak‑free seal and consistent spray performance.
| Part Number | 0533559 |
|---|---|
| Part Description | O‑ring, Regulator (seals regulator stem, Buna‑N / nitrile rubber) |
| Brand | Titan |
| Fits | AirCoat 423 |
| Condition | New |
The Titan 0533559 O‑ring, Regulator, 423 is a precision elastomeric seal used in the pressure regulator assembly of the AirCoat 423 sprayer. It is typically installed on the regulator stem or adjustment shaft, creating a dynamic seal that prevents fluid from leaking past the adjustment mechanism. A properly functioning O‑ring ensures that pressure adjustments are accurate and that no material escapes around the control knob.
O‑rings in regulator assemblies are exposed to coating materials, solvents, and mechanical movement. Over time, they can harden, swell, crack, or take a compression set. A failed regulator O‑ring results in visible fluid seepage around the adjustment knob, sticky or inconsistent adjustment feel, and potential pressure instability. Replacing the O‑ring with the OEM component restores a tight seal and reliable regulator performance.
| Fluid sealing | Prevents coating material from leaking past the adjustment stem |
|---|---|
| Pressure integrity | Maintains hydraulic pressure within the regulator body |
| Adjustment feel | Provides smooth, consistent resistance for precise pressure setting |
| Fluid leak around knob | Visible material seepage from regulator adjustment area |
|---|---|
| Stiff / sticky adjustment | Knob hard to turn or feels rough |
| Pressure instability | Set pressure drifts or fluctuates without knob movement |
| Visible O‑ring damage | Flattened, cracked, hardened, or swollen seal during inspection |
Part 0533559 is the OEM regulator O‑ring for the following Titan sprayer model. Always verify with your machine's parts diagram.
| Brand / Model | Component |
|---|---|
| AirCoat 423 | O‑ring, Regulator |
When replacing the regulator O‑ring, inspect or replace these related regulator components.
The O‑ring seals the stem; inspect the stem for wear, bending, or corrosion.
If the regulator is disassembled, inspect the spring for fatigue.
If the O‑ring has failed, the diaphragm may also be worn; consider a full rebuild.
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