The Honda 78101-YB8-013 Casing is a genuine OEM replacement built for WT20 and WT30 water pumps. As a direct Honda OEM component, this casing is manufactured to the same specification as the original, ensuring proper clearances and a correct fit within the pump assembly. This part is designed for WT20 and WT30 models, so confirm your pump's model and serial number against the fitment table before ordering.
Key Features
- Genuine OEM Volute Integrity — manufactured by Honda to maintain the internal geometry that controls water flow, pressure, and pump efficiency on WT20 and WT30 water pumps.
- Exact Replacement Fit — this casing is engineered to align directly with the impeller, wear ring, and pump housing components, restoring the running clearances the pump depends on.
- Fits WT20 and WT30 Water Pumps — including WT20 and WT30 models; verify your serial number against the fitment table, as Honda supersedes parts at serial breaks.
- Restores Pump Output — a cracked, worn, or damaged casing allows pressure to bypass the impeller, causing a drop in flow rate and discharge head; replacing it brings pump performance back to spec.
The casing is the outer housing that forms the volute of a centrifugal water pump. It surrounds the spinning impeller and converts the kinetic energy generated by impeller rotation into pressure, directing water from the inlet toward the discharge port. When the casing is cracked or worn — particularly at the internal wear surfaces — the pump loses its ability to build and hold pressure, resulting in reduced flow, poor priming, or complete loss of discharge. Replacing a damaged casing restores the sealed chamber the impeller needs to move water efficiently.
Part Details
| Part Number | 78101-YB8-013 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Casing |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Water Pump | WT20, WT30 | 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.
