The Honda 78118-YB0-004 Seal Ring (B) is a genuine OEM component designed for GX120 and GX160 horizontal shaft engines and a wide range of Honda water pumps, including the WA15, WB15, WB20, WB30, WD20, WD30, WH15, WH20, WX10, and WX15. As a direct Honda OEM part, it is manufactured to the same specification as the original, ensuring correct sizing and sealing performance across every compatible application. Because Honda supersedes seal ring part numbers at production breaks, confirm your unit's serial number against the fitment table before ordering to make sure part number 78118-YB0-004 is the correct variant for your machine.
Key Features
- Genuine OEM Seal Integrity — sourced directly from Honda, this seal ring is dimensioned to the exact profile required for a leak-free interface on every listed application.
- Broad Compatibility — fits GX120 and GX160 horizontal shaft engines as well as Honda WA15, WB15, WB20, WB30, WD20, WD30, WH15, WH20, WX10, and WX15 water pumps.
- Variant Identification — the "(B)" designation distinguishes this seal ring from other seal ring variants; match it carefully to your parts diagram to confirm you need this specific size.
- Serial Number Verification Recommended — Honda updates seal specifications at production breaks, so cross-check your machine's serial number with the compatibility table before completing your order.
A seal ring creates a fluid-tight barrier at a joint or interface within the engine or pump assembly, preventing water, oil, or other fluids from bypassing the mating surfaces. In a water pump, a compromised or worn seal ring allows fluid to escape the pump housing, leading to pressure loss and potential damage to surrounding components. Replacing a failed seal ring with the correct OEM part restores the intended sealing performance and returns the pump or engine to proper operating condition.
Part Details
| Part Number | 78118-YB0-004 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Seal Ring (B) |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Horizontal Shaft Engine | GX120, GX160 | All |
| Water Pump | WH15, WH20 | 1871783-9999999 |
| Water Pump | WA15, WB15, WB20, WB30, WD20, WD30, WX10, WX15 | 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.
