Part 315-122 is a synthetic rubber O-ring designed for use in Hydra M and Hydra Pro Super airless paint sprayers. This O-ring provides a critical seal between fluid sections, manifolds, or filter housings to prevent leaks and maintain pressure integrity. Replacing a worn, flattened, or cracked O-ring restores proper sealing and helps eliminate fluid leaks.
| Part Number | 315-122 |
|---|---|
| Part Description | O-ring, Synthetic Rubber |
| Brand | Hydra |
| Fits | Hydra M; Hydra Pro Super |
| Condition | New |
The 315-122 synthetic rubber O‑ring is a precision sealing component used in critical fluid pathways of Hydra M and Hydra Pro Super airless paint sprayers. It provides a durable, leak‑tight seal between manifold sections, filter housings, pump intake connections, or other hydraulic interfaces where exposure to paint, solvents, and pressure is common.
Over time, O‑rings can become hardened, flattened, cracked, or swollen due to chemical exposure and thermal cycling. A deteriorated O‑ring is a frequent cause of fluid leaks, pressure loss, and erratic spray performance. Replacing worn seals with a genuine synthetic rubber O‑ring restores system integrity and helps extend the life of the sprayer.
| Fluid sealing | Prevents leaks at connection points between manifold, filter housing, and pump |
|---|---|
| Pressure retention | Helps maintain consistent system pressure for proper spray pattern |
| Chemical resistance | Synthetic rubber formulation resists degradation from paints and solvents |
| Visible fluid leaks | Paint or solvent seeping from a joint or housing |
|---|---|
| Flattened / hardened ring | O‑ring no longer rebounds or has taken a permanent set |
| Cracking or swelling | Visible cracks, splits, or dimensional change from chemical attack |
| Pressure fluctuation | Loss of prime or unstable pressure traced to a seal failure |
Part number 315-122 is used on the following Hydra airless sprayer models. Always consult the parts diagram for your specific machine to confirm location and quantity.
| Sprayer Model | Component |
|---|---|
| Hydra M | Synthetic Rubber O‑ring |
| Hydra Pro Super | Synthetic Rubber O‑ring |
When replacing an O‑ring due to a leak, it is good practice to inspect these associated components.
Check for nicks, corrosion, or warpage on the sealing surfaces that could cause future leaks.
If the O‑ring is part of the pump inlet/outlet, consider a full pump seal kit for comprehensive service.
Proper assembly lubricant ensures the O‑ring seats correctly and prevents twisting.
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