The Honda 78107-YB3-K10 Volute Case is a genuine OEM replacement built for WB20 and WD20 water pumps. As a direct Honda OEM component, this part is manufactured to the same specifications as the original, ensuring an exact fit within the pump housing. This Volute Case is confirmed compatible with WB20 and WD20 models — verify your pump's serial number against the fitment table to confirm the correct part for your unit.
Key Features
- Genuine Honda OEM Construction — manufactured to Honda's original specifications, ensuring the internal flow geometry of the volute matches the impeller precisely for correct pump output
- Direct Replacement Fit — designed to drop into WB20 and WD20 water pumps without modification, restoring the pump casing to its original form and function
- Check Your Serial Number — Honda updates parts at production breaks, so confirm your pump's serial number against the fitment table before ordering
- Critical to Pump Performance — a cracked, worn, or damaged volute case causes pressure loss and reduced flow; replacing it restores the pump's rated output
The volute case is the spiral-shaped housing that surrounds the impeller in a centrifugal water pump. As the impeller spins, it flings water outward into the gradually widening volute chamber, which converts the water's velocity into pressure and directs it toward the discharge outlet. A damaged or deteriorated volute case disrupts this flow path, resulting in significant drops in pressure and pumping capacity — or complete loss of prime in severe cases.
Part Details
| Part Number | 78107-YB3-K10 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Volute Case |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Water Pump | WB20, WD20 | 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.
