The Honda 78104-YB3-631 Outlet Pipe is a genuine OEM replacement designed for Honda WB20, WD20, WH15, and WH20 water pumps. As a direct OEM replacement, this part is manufactured to Honda's original specifications, ensuring the correct bore diameter, port alignment, and connection geometry for a proper install. Sourced directly through Honda's parts network, part number 78104-YB3-631 gives you the confidence that this component matches what left the factory. Check your pump's serial number against the fitment table to confirm this is the correct pipe for your specific unit before ordering.
Key Features
- Genuine Honda OEM Part — manufactured to original Honda specifications, so port sizing and connection geometry match the pump's discharge circuit exactly, with no adapting or improvising required.
- Correct Flow Path — the Outlet Pipe defines the discharge bore through which all pumped water exits; an original-spec replacement maintains rated flow capacity and prevents pressure drop at the discharge point.
- Broad Pump Compatibility — fits WB20, WD20, WH15, and WH20 Honda water pumps, covering both general-purpose and high-pressure centrifugal pump models.
- Verify Before You Order — Honda updates parts at production serial breaks, so confirm your pump's serial number against the fitment table to ensure part number 78104-YB3-631 is the correct outlet pipe for your unit.
The Outlet Pipe is the discharge-side fitting through which water exits the pump volute and enters the delivery hose or piping system. It defines the size and shape of the discharge port, and its condition directly affects the pump's ability to deliver water at rated volume and pressure. A cracked, corroded, or damaged outlet pipe will cause leaks at the discharge connection, reduce system pressure, and can make a pump appear to underperform even when the impeller and volute are in good condition. Replacing a worn or failed pipe with a genuine OEM part restores the integrity of the discharge circuit and returns the pump to its full rated output.
Part Details
| Part Number | 78104-YB3-631 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Outlet 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.
