The Honda 78101-YG4-000 Casing is a genuine OEM replacement designed for WB30 water pumps. As a direct Honda OEM part, it is manufactured to the exact tolerances required for proper pump operation, ensuring the internal hydraulic path is maintained as Honda intended. Confirm your unit's serial number against the fitment table before ordering to make sure this casing is the correct match for your WB30.
Key Features
- Genuine OEM Construction — sourced directly from Honda, this casing meets the dimensional and material requirements of the original part, maintaining the pump's designed flow characteristics and internal clearances.
- Critical Hydraulic Component — the casing forms the volute housing that surrounds the impeller, directing water flow from the inlet through to the discharge port. A cracked, worn, or damaged casing causes pressure loss and reduced output volume.
- Direct Replacement for WB30 Water Pumps — engineered specifically for the WB30, this part installs in place of the original without modification.
- Check Your Serial Number — Honda updates parts at production serial breaks, so verify your pump's serial number against the compatibility table to confirm this casing applies to your unit.
The casing is the outer housing of the pump's wet end, forming the volute chamber that encases the impeller and converts rotational energy into water pressure and flow. It directs incoming water around the spinning impeller and channels it toward the discharge outlet, and its internal geometry directly determines how efficiently the pump moves fluid. When the casing is cracked, eroded, or badly worn, the pump loses the tight internal clearances it depends on, resulting in a drop in flow rate, reduced discharge pressure, and potential overheating of the pump body.
Part Details
| Part Number | 78101-YG4-000 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Casing |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Water Pump | WB30 | 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.
