The Honda 78101-YB7-020 Casing is a genuine OEM component designed for WH15 and WH20 water pumps. As a direct Honda OEM part, it is built to the same specifications as the original, ensuring a correct fit and proper function within the pump assembly. This casing is engineered for WH15 and WH20 units — confirm your pump model and serial number against the fitment table before ordering, as Honda updates parts at serial breaks.
Key Features
- Genuine OEM Construction — manufactured by Honda to original specifications, ensuring the pump volute geometry is maintained for correct water flow and pressure output
- Direct Replacement Housing — this casing installs in place of the original without modification, restoring the structural enclosure of the pump's internal components
- WH15 and WH20 Fitment — designed specifically for Honda WH15 and WH20 water pumps; verify your serial number against the fitment table to confirm the correct part for your unit
- Restore Pump Integrity — a cracked or worn casing compromises pressure, allows leaks, and can cause total pump failure; replacing it with part number 78101-YB7-020 returns the pump to full working order
The casing is the outer housing that encloses the impeller and forms the volute of a centrifugal water pump. It directs the flow of water from the inlet, around the spinning impeller, and out through the discharge port — the shape of the volute is what converts the impeller's rotational energy into pressure and flow. When the casing is cracked, eroded, or damaged, the pump loses prime, output pressure drops, and water can escape from the housing itself, making a serviceable casing essential to the pump operating as intended.
Part Details
| Part Number | 78101-YB7-020 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Casing |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Water Pump | 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.
