The Honda 78107-YB0-612 Volute Case is a genuine OEM component designed for the WA15 water pump. Sourced directly from Honda, this part meets the exact design standards of the original — ensuring the impeller operates within the correct housing geometry for consistent pump performance. If your WA15 is losing prime, producing reduced flow, or showing signs of housing damage or wear, this Volute Case is the correct OEM replacement to restore it to working order.
Key Features
- Genuine OEM Housing Geometry — manufactured to Honda's original specifications, maintaining the precise internal profile the impeller depends on for efficient water movement and proper pressure generation
- Direct OEM Replacement — engineered to fit the WA15 water pump without modification, restoring the pump casing to its original configuration
- Verify Your Serial Number — Honda updates parts at production serial breaks, so confirm part number 78107-YB0-612 against your pump's serial number before ordering
- Restores Full Pump Output — a cracked, eroded, or damaged volute disrupts the fluid path and drops flow rate; replacing this case brings pump output back to specification
The volute case is the spiral-shaped housing that surrounds the pump impeller. As the impeller spins, the volute converts the high-velocity water leaving the impeller into usable pressure by gradually expanding the internal passage — slowing the flow and building discharge pressure in the process. On the WA15 water pump, the condition of this housing directly determines how efficiently the pump moves water: a worn, cracked, or damaged volute allows internal recirculation and pressure loss, reducing both flow rate and lift capacity. Replacing a degraded case is one of the most effective ways to recover a pump that has lost performance over time.
Part Details
| Part Number | 78107-YB0-612 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Volute Case |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Water Pump | WA15 | 1000001-1340457 |
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.
