The Honda 78111-YE0-003 Check Valve is a genuine OEM component designed for the WMP20 water pump. Sourced directly from Honda, this check valve delivers the exact fit and function the WMP20 demands — no guesswork, no adaptation. Honda recommends verifying the serial number on your unit against the fitment table to confirm this is the correct part for your pump build.
Key Features
- Genuine OEM Flow Control — Honda-sourced to ensure the valve opens and seats at the pressures the WMP20 is engineered for, maintaining proper one-way flow through the pump's discharge circuit.
- Direct OEM Replacement — built to Honda's original specifications, this check valve installs directly into the WMP20 without modification, restoring the pump to its original operating condition.
- Serial Number Verification Recommended — Honda updates parts at production breaks, so confirm your pump's serial number against the fitment table before ordering to ensure you receive the correct valve for your unit.
A check valve allows fluid to flow in one direction only, preventing backflow through the pump when the unit is stopped or pressure drops on the outlet side. In the WMP20 water pump, this component keeps the discharge circuit primed and prevents water from draining back through the pump body between cycles. When a check valve fails — whether through a worn seat, a stuck disc, or debris fouling the sealing surface — the pump loses prime, output pressure drops, and the unit may struggle to self-prime on restart.
Part Details
| Part Number | 78111-YE0-003 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Check Valve |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Water Pump | WMP20 | 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.
