The Honda 18310-Z0H-801 Muffler is a genuine OEM replacement built for GX25 horizontal shaft engines, HHT25 and UMC425 trimmers, and the WX10 water pump. As a direct Honda OEM part, it is manufactured to the same specifications as the original component it replaces, ensuring a proper fit without modification. Confirm your unit's serial number against the fitment table before ordering, as Honda supersedes parts at serial breaks and more than one variant may be listed for these models.
Key Features
- Genuine Honda OEM Construction — manufactured by Honda to the same specification as the original muffler, delivering the exhaust flow and back-pressure characteristics these small-displacement engines are tuned for
- Broad Cross-Model Fitment — designed for GX25 horizontal shaft engines, HHT25 and UMC425 trimmers, and the WX10 water pump; verify your model and serial number to confirm the correct variant for your unit
- Drop-In Replacement — this muffler is a direct OEM replacement that mounts to the existing exhaust port, keeping the service procedure straightforward
- Restored Exhaust Performance — a cracked, corroded, or perforated muffler allows unsilenced exhaust gases to escape, raising noise levels and potentially affecting engine tuning; replacing it restores proper operation
The muffler channels hot exhaust gases away from the engine's exhaust port and dissipates them safely while reducing combustion noise to an acceptable level. On small-displacement equipment such as trimmers and compact water pumps, the muffler's internal baffling is sized to match the engine's displacement and tuning — an ill-fitting or damaged unit can disrupt exhaust scavenging and reduce output. When the muffler cracks, corrodes through, or develops a failed gasket joint, exhaust noise increases sharply and unburned gases can escape near the operator; replacing it with part number 18310-Z0H-801 restores the exhaust system to its original condition.
Part Details
| Part Number | 18310-Z0H-801 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Muffler |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Horizontal Shaft Engine | GX25 | All |
| Trimmer | HHT25, UMC425 | All |
| Water Pump | WX10 | 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.
