Part 441-249 U-Cup Piston Seal is a precision elastomeric sealing component designed for Hydra M and Hydra Pro Super series equipment. This U-cup style seal fits around the piston to create a dynamic seal against the cylinder wall, preventing fluid bypass during the pumping stroke. Replacing a worn, hardened, or damaged piston seal restores pump efficiency, maintains system pressure, and ensures reliable fluid delivery.
| Part Number | 441-249 |
|---|---|
| Part Description | U-Cup Piston Seal |
| Brand | Hydra |
| Fits | Hydra M, Hydra Pro Super |
| Condition | New |
The 441-249 U-Cup Piston Seal is a precision-molded elastomeric seal used in Hydra M and Hydra Pro Super series pump assemblies. Its U-shaped cross-section provides excellent sealing characteristics under pressure, with the lips of the seal expanding against the cylinder wall during the pumping stroke to prevent fluid bypass while accommodating the reciprocating motion of the piston.
Over time, piston seals can become hardened from heat exposure, worn from continuous motion, or damaged by abrasive materials in the fluid. A compromised seal leads to internal bypass, reduced pump output, pressure loss, and poor priming. Replacing with this OEM-specification U-cup seal restores proper pump efficiency and extends the life of the entire pump assembly.
| Dynamic sealing | Seals between moving piston and cylinder wall |
|---|---|
| Pressure activation | U-cup design uses system pressure to enhance sealing |
| Fluid containment | Prevents fluid bypass during pumping stroke |
| Wear resistance | Designed for extended service life in demanding applications |
| Pressure loss | Unable to maintain operating pressure |
|---|---|
| Poor priming | Pump loses prime or fails to prime |
| Visible wear | Seal lips are worn, cracked, or damaged |
| Hardening | Seal material has lost flexibility |
This U-cup piston seal is designed for the following models. Always verify your equipment's parts diagram to ensure correct fit and application.
| Brand / Model | Component |
|---|---|
| Hydra M | U-cup piston seal |
| Hydra Pro Super | U-cup piston seal |
When servicing U-cup piston seals, these associated components are often inspected or replaced at the same time.
Inspect piston for scoring or wear; replace if damaged.
Check cylinder wall for scoring or wear that could damage new seals.
Replace associated rings that support or protect the seal.
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