The Honda 78130-YB7-003 Mechanical Seal is a genuine OEM component designed for WH15 and WH20 water pumps. As a factory-sourced part, it meets Honda's original design specifications, ensuring a correct fit without modification. Confirm your pump's serial number against the fitment table before ordering, as Honda supersedes parts at serial breaks and more than one variant may apply to these models.
Key Features
- Genuine OEM Sealing Integrity — sourced directly from Honda, this seal matches the original design tolerances that keep pump fluid contained and prevent internal leakage that leads to pressure loss
- Direct-Fit Replacement — built to replace the original part number 78130-YB7-003 exactly, with no rework needed during installation
- WH15 and WH20 Water Pump Fitment — verified for Honda WH15 and WH20 water pumps; check your serial number against the compatibility table to confirm the correct variant for your unit
- Pump Performance Restored — a worn or leaking mechanical seal allows water to bypass internally, reducing output pressure and flow; replacing it restores the pump to proper working condition
A mechanical seal sits between the rotating pump shaft and the pump housing, creating a dynamic, fluid-tight barrier that prevents water from leaking along the shaft while the impeller spins. In a water pump like the WH15 and WH20, this seal is under continuous load during operation — if it wears or fails, water escapes past the shaft, pressure drops, and the pump loses output. Replacing a degraded mechanical seal is one of the most direct ways to bring a pump back to its full rated flow.
Part Details
| Part Number | 78130-YB7-003 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Mechanical Seal |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Water Pump | WH15, WH20 | All |
Verify Before You Order
Fitment is machine-number and revision-specific; always confirm your model and serial number against the fitment list.
Why Buy From DHS Equipment
Every part is verified against the manufacturer's part number before it ships, so what you order is what arrives. We carry parts from leading OEM brands and our own DHS Quality Parts line of professional aftermarket components. Need help finding the right part? Our team is available to confirm compatibility whenever you need it. Orders are processed fast to keep your jobs on track. We don't just sell parts. We keep you jobsite ready.
Questions? Contact our team at [email protected] or 866-611-9369 — DHS Equipment is here to help you maintain peak performance.
