The Honda 78103-YB3-630 Inlet Pipe is a genuine OEM replacement designed for Honda WB20, WD20, WH15, and WH20 water pumps. As a direct Honda OEM component, this inlet pipe is manufactured to the same specifications as the original part, ensuring a correct fit within the pump's intake circuit. Honda supersedes parts at production serial breaks, so verify your pump's serial number against the fitment table before ordering to confirm this is the right pipe for your unit. This part installs directly in place of the original, with no modification needed to the pump housing or intake connections.
Key Features
- Genuine Honda OEM Construction — manufactured to the same specification as the original, so intake flow geometry and connection dimensions are exactly matched to the pump's design.
- Correct Intake Fit — engineered to seat properly within the pump's inlet assembly, maintaining the seal and alignment the intake circuit depends on for consistent water draw.
- Broad Pump Compatibility — fits Honda WB20, WD20, WH15, and WH20 water pumps, covering Honda's general-purpose and high-pressure centrifugal pump lineup.
- Serial Number Verification Recommended — Honda updates components across production runs, so cross-check your pump's serial number against the fitment table to confirm applicability before installing.
The inlet pipe is the intake passage through which water is drawn into the pump before reaching the impeller. It connects the suction hose fitting to the pump body, channeling fluid into the volute where the spinning impeller builds pressure and moves it through to the discharge side. A cracked, warped, or deteriorated inlet pipe breaks the airtight seal the suction side requires — even a small air leak at this point will cause the pump to lose prime, reduce flow rate, or fail to prime altogether, leaving the unit unable to move water efficiently.
Part Details
| Part Number | 78103-YB3-630 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Inlet Pipe |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Water Pump | WB20, WD20, 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.
