Titan part 891-403 is a PTFE O‑ring designed for high‑pressure fluid sealing applications on compatible Hydra M 2000, Hydra M 4000, Hydra Pro Super, Commander, and Admiral sprayers. PTFE (polytetrafluoroethylene) provides excellent chemical resistance, low friction, and a wide temperature range, making it ideal for sealing aggressive coatings and solvents. Replacing a worn, cut, or flattened O‑ring restores leak‑free operation and prevents fluid bypass or pressure loss in the pump or valve assembly.
| Part Number | 891-403 |
|---|---|
| Part Description | O‑Ring, PTFE |
| Brand | Titan |
| Fits | Hydra M 2000, Hydra M 4000, Hydra Pro Super; Commander (741‑440, 761‑301, 761‑411, 741‑331); Admiral (830‑331, 860‑451, 830‑451, 941‑441) |
| Condition | New |
The Titan 891-403 PTFE O‑ring is a precision‑molded sealing component used in fluid sections, valve assemblies, and pump heads on Titan Hydra M, Hydra Pro Super, Commander, and Admiral sprayers. PTFE material offers exceptional chemical compatibility with virtually all paints, coatings, solvents, and corrosion inhibitors, plus low friction that reduces wear on mating surfaces.
O‑rings naturally compress and take a set over time. Exposure to pressure cycles, temperature changes, and aggressive fluids can cause PTFE O‑rings to flatten, crack, or extrude. A damaged O‑ring leads to external leaks, internal bypass, pressure drop, or erratic spray gun operation. Replacing with genuine Titan 891-403 restores the original seal geometry, ensuring leak‑free performance and consistent fluid delivery.
| Static sealing | Prevents fluid leaks at joints and covers |
|---|---|
| Dynamic sealing | Seals around reciprocating pistons or rods |
| Chemical resistance | Withstands solvents, acids, and aggressive coatings |
| Visible flattening | O‑ring no longer has round cross section |
|---|---|
| Cracks or nicks | Surface damage from installation or debris |
| Hardening | PTFE becomes brittle, loses flexibility |
| Leakage | Fluid escaping from the sealed joint |
| During rebuild | Always replace O‑rings when disassembling the fluid section |
Titan part 891-403 is compatible with the following sprayer models. Always confirm fitment using the correct parts diagram for your exact machine and serial number.
| Model / Series | Component |
|---|---|
| Hydra M 2000, Hydra M 4000 | O‑Ring, PTFE |
| Hydra Pro Super | O‑Ring, PTFE |
| Commander 741‑440, 761‑301, 761‑411, 741‑331 | O‑Ring, PTFE |
| Admiral 830‑331, 860‑451, 830‑451, 941‑441 | O‑Ring, PTFE |
When replacing a PTFE O‑ring, inspect or replace these associated components to ensure a complete seal repair.
Some applications use a PTFE back‑up ring with the O‑ring; inspect for distortion and replace as a set.
Check for scoring or wear that may have damaged the O‑ring; rebuild if necessary.
If the O‑ring seals a valve cover, inspect the seat surface for pitting or debris.
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