The Honda 90503-YB8-003 Seal Gasket is a genuine OEM component designed for WT20 and WT30 water pumps. As a direct Honda OEM part, this seal gasket is manufactured to the exact specifications required for a proper sealing surface, ensuring the pump can build and hold pressure as intended. This part is listed for the WT20 and WT30 — verify your pump model and serial number against the fitment table before ordering. Honda supersedes parts at serial breaks, so confirming your serial number is the most reliable way to ensure you receive the correct version.
Key Features
- OEM Sealing Integrity — genuine Honda construction means the gasket material and profile match the sealing surfaces exactly, preventing fluid bypass that can rob the pump of pressure or cause visible leaks
- Direct OEM Replacement — sourced directly from Honda, part number 90503-YB8-003 installs without modification as a like-for-like swap on the WT20 and WT30
- Serial Number Verification Recommended — Honda updates parts at production serial breaks, so match your pump's serial number to the fitment table to confirm this is the correct seal gasket for your unit
A seal gasket creates a fluid-tight joint between mating surfaces inside or around the pump assembly, preventing water from bypassing or leaking at that interface. In a centrifugal water pump like the WT20 and WT30, maintaining a proper seal is essential to sustaining flow rate and output pressure — a compromised or degraded gasket allows water to escape the intended flow path, leading to pressure loss and potential water damage to surrounding components. Replacing a worn or damaged seal gasket restores the pump's ability to move water efficiently and keeps the housing sealed during operation.
Part Details
| Part Number | 90503-YB8-003 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Seal Gasket |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Water Pump | WT20, WT30 | 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.
