The Multiquip 21950 Muffler Gasket HTX Yanmar is a genuine OEM component designed for HTX44Y4 and HTX44Y5 hydrostatic ride-on power trowels. Sourced directly from Multiquip, this gasket meets the exact specifications of the original part it replaces, ensuring a proper seal between the exhaust port and muffler on Yanmar-powered HTX series machines. Cross-referenced as Yanmar part 129403-18091, the 21950 is the correct OEM replacement for both Y4 and Y5 Yanmar engine variants in this series.
Key Features
- Genuine OEM Sealing Integrity — Manufactured to the exact compression and material grade of the original Yanmar exhaust gasket, ensuring a leak-free seal at the muffler joint.
- Direct-Fit Replacement — Matches the original mounting pattern and thickness for drop-in installation on HTX44Y4 and HTX44Y5 trowels without rework or shimming.
- Yanmar Engine Cross-Reference — Validated against Yanmar part number 129403-18091, confirming compatibility across both Y4 and Y5 engine variants in the HTX44 platform.
- Exhaust Containment Performance — A properly seated muffler gasket prevents hot exhaust gases from escaping the joint, protecting surrounding components and maintaining correct back-pressure for engine efficiency.
- Exhaust Safety Compliance — Sealing the muffler connection correctly prevents operator exposure to exhaust leaks at the engine, a meaningful safety consideration on ride-on equipment where the operator sits close to the power unit.
The muffler gasket forms the sealing interface between the engine exhaust port and the muffler assembly, preventing combustion gases from escaping before they reach the intended exhaust outlet. On Yanmar-powered trowels like the HTX44 series, a failed or deteriorated gasket allows hot exhaust gases to leak at the joint, which can cause heat damage to nearby wiring or hoses, produce noticeable exhaust odor in the operator's environment, and reduce engine efficiency due to lost back-pressure. Replacing a worn gasket promptly restores a complete exhaust seal and protects the surrounding components from heat exposure.
Part Details
| Part Number | 21950 |
|---|---|
| Brand | Multiquip |
| Part Type | Genuine OEM |
| Description | Muffler Gasket HTX Yanmar |
Compatibility & Fitment
| Name | Model |
|---|---|
| Whiteman Ride-On Power Trowels | HTX44Y4 |
| Whiteman Ride-On Power Trowels | HTX44Y5 |
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.
