The Honda 18381-ZL8-305 Muffler Gasket is a genuine OEM replacement designed for a wide range of Honda engines, generators, tillers, lawn mowers, and water pumps — including GC135, GC160, GC190, GCV135, GCV160, GCV170, GCV190, GCV200, GS160, GS190, and GSV190 engines, EN2000 and EN2500 generators, FG400 and FG500 tillers, WN20 and WN30 water pumps, and lawn mowers including HRB216, HRB217, HRC216, HRN216, HRR216, HRS216, HRT216, HRX217, and HRZ216. As a genuine Honda part, it is manufactured to the same specification as the original component it replaces, ensuring a proper seal between the muffler and the exhaust port. Because Honda supersedes parts across serial breaks, always verify your unit's serial number against the fitment table before ordering to confirm part number 18381-ZL8-305 is the correct match for your machine.
Key Features
- Exhaust Sealing Integrity — engineered to maintain a tight, leak-free seal at the muffler-to-exhaust-port joint, preventing hot exhaust gases from escaping around the connection
- Genuine Honda OEM Part — sourced directly from Honda, this gasket meets the same specification as the original, ensuring correct thickness and material grade for consistent clamping retention
- Broad Fitment — covers an extensive range of Honda horizontal and vertical shaft engines, generators, tillers, water pumps, and walk-behind lawn mowers; check your serial number against the fitment table to confirm compatibility
- Direct Drop-In Replacement — matches the original gasket dimensions exactly, so it seats correctly without trimming or modification during reinstallation
The muffler gasket forms the seal between the exhaust port on the engine and the muffler itself, preventing exhaust gases from leaking at that joint. A sound seal keeps exhaust directed properly through the muffler, maintaining the noise and heat management the system is designed to provide. When this gasket deteriorates or burns through, exhaust leaks at the joint — producing a loud ticking or hissing noise, increasing heat around the exhaust area, and allowing combustion byproducts to escape before they reach the muffler. Replacing a failed gasket with a proper OEM part restores the integrity of the exhaust connection and returns the engine to normal operation.
Part Details
| Part Number | 18381-ZL8-305 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Muffler Gasket |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Generator | EN2000, EN2500 | All |
| Horizontal Shaft Engine | GC135, GC160, GC190, GS160, GS190 | All |
| Lawn Mower | HRB216, HRB217, HRC216, HRN216, HRR216, HRS216, HRT216, HRX217, HRZ216 | All |
| Tiller | FG400, FG500 | All |
| Vertical Shaft Engine | GCV160 | 3406724-9999999 |
| Vertical Shaft Engine | GCV135, GCV170, GCV190, GCV200, GSV190 | All |
| Water Pump | WN20, WN30 | 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.
