The Honda 78101-YG0-023 Pump Casing is a genuine OEM replacement built for WT20 and WT30 water pumps. As a direct Honda OEM part, it is manufactured to the same specifications as the original, ensuring the volute geometry and port dimensions are correct for proper hydraulic performance. This casing is confirmed for WT20 and WT30 water pumps — verify your pump model and serial number against the fitment table before ordering, as Honda supersedes parts at serial breaks. When the original casing is cracked, worn, or damaged, this genuine replacement restores full pumping capacity and brings your pump back to proper operating condition.
Key Features
- Genuine Honda OEM Construction — manufactured to Honda's original specifications, with correct volute geometry to maintain rated flow and head pressure on WT20 and WT30 pumps.
- Exact Hydraulic Fit — the casing's internal profile is matched to the impeller clearances Honda engineered into these pumps; an ill-fitted casing reduces flow and strains the engine.
- Confirmed Fitment — designed for WT20 and WT30 water pumps; check your serial number against the fitment table, as Honda issues part supersessions at production breaks.
- Restores Pumping Performance — a cracked or worn casing allows pressure to bypass the impeller, cutting output volume and discharge head; replacing it returns the pump to full rated performance.
The pump casing is the main structural housing that surrounds the impeller and forms the volute — the curved channel that converts the impeller's rotational energy into flow and pressure. Water enters through the suction port, is accelerated by the spinning impeller, and is directed by the casing's volute profile toward the discharge port. When the casing is cracked, eroded, or damaged, the tight running clearance between impeller and housing is lost, pressure bleeds back across the gap, and the pump delivers significantly reduced flow and lift. Replacing a damaged casing is one of the most direct ways to restore a centrifugal pump to its original performance specification.
Part Details
| Part Number | 78101-YG0-023 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Pump 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.
