The Honda 78123-YB9-003 Liner is a genuine OEM component designed for WT20 and WT30 water pumps. As a direct Honda OEM part, it is manufactured to the same specifications as the original, ensuring a proper fit within the pump housing. This liner is a correct match for both the WT20 and WT30, but buyers should verify their unit's serial number against the fitment table before ordering, as Honda supersedes parts at serial breaks.
Key Features
- Genuine Honda OEM — sourced directly from Honda, this liner meets the same standards as the part installed at the factory, with no guesswork on dimensional accuracy inside the pump volute.
- Pump Wear Surface Integrity — the liner forms the critical wear surface within the pump casing; a worn or damaged liner reduces pumping efficiency and flow output, making timely replacement essential to keeping the pump running at rated capacity.
- Fits WT20 and WT30 Water Pumps — confirmed fitment for Honda WT20 and WT30 centrifugal water pumps; check your serial number against the fitment table to confirm this is the correct liner revision for your unit.
The liner sits inside the pump casing and forms the close-clearance housing around the impeller in a centrifugal water pump. This running clearance between the impeller and the liner is what allows the pump to build pressure and move water efficiently — if that clearance grows through wear, the pump loses prime more easily and delivers reduced flow. Replacing a worn liner restores the pump's ability to move water at its rated volume, keeping the WT20 or WT30 performing as intended on the job.
Part Details
| Part Number | 78123-YB9-003 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Liner |
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.
