The Honda 78313-YB4-010 Coupling Gasket is a genuine OEM replacement designed for WD20 and WD30 water pumps. As a direct Honda OEM component, this gasket is manufactured to the exact specifications required for a proper, leak-free seal at the coupling connection on these pumps. Confirm your pump model and serial number against the fitment table before ordering — Honda supersedes parts at serial breaks, and verifying part number 78313-YB4-010 against your unit ensures you receive the correct coupling gasket for your machine.
Key Features
- Genuine OEM Sealing Integrity — produced by Honda to meet the exact tolerances required for a secure, leak-free coupling seal on WD20 and WD30 water pumps, where even minor sealing failures can result in pressure loss or water ingress
- Direct OEM Replacement — this coupling gasket installs as a like-for-like replacement with no modification needed, restoring the pump coupling to its original sealing condition
- WD20 and WD30 Fitment — confirmed for Honda WD20 and WD30 water pumps; verify your serial number against the fitment table, as Honda updates part supersessions across production runs
- Pump Performance Restored — a damaged or compressed coupling gasket allows water to bypass the coupling joint, reducing flow efficiency and potentially causing external leakage; replacing it with this OEM gasket brings the joint back to spec
The coupling gasket forms a fluid-tight seal at the coupling joint of the water pump — the connection point where pump housing sections or discharge components mate together. Its role is to prevent water from escaping at that joint under the pressure the pump generates during operation. When this gasket deteriorates, cracks, or is compressed beyond its serviceable limit, the coupling joint can leak, reducing the pump's output pressure and causing water loss that affects overall pumping efficiency. Replacing a worn coupling gasket promptly keeps the WD20 and WD30 water pumps operating at their rated flow and pressure.
Part Details
| Part Number | 78313-YB4-010 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Coupling Gasket |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Water Pump | WD20, WD30 | 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.
