Multiquip 21451 HHN ACS Stainless 34VTD Muffler

The Multiquip 21451 is a genuine OEM HHN ACS Stainless 34VTD Muffler designed for Whiteman ride-on power trowel models HHXD5, HHXG5, and HHXD5-ES. As a direct Multiquip OEM component, part 21451 is manufactured to the same specification as the original unit installed at the factory, ensuring a correct fit within the exhaust system of these large-format mechanical trowels. Stainless steel construction gives this muffler lasting resistance to the heat cycling and corrosion that comes with demanding concrete finishing work. DHS Equipment stocks this part so you can get your trowel back up and running without delay.

Key Features

• Stainless Steel Durability — Constructed from stainless steel to withstand the extreme heat and corrosive exhaust gases produced during continuous troweling operations.
• Genuine OEM Component — Sourced directly from Multiquip, this muffler meets the exact exhaust back-pressure and mounting specifications of the original part, preserving engine performance and sound attenuation.
• Confirmed Fitment — Verified for Whiteman ride-on power trowel models HHXD5, HHXG5, and HHXD5-ES; use part number 21451 to match against your machine's parts diagram before ordering.
• Exhaust Integrity Restored — A failed or cracked muffler allows uncontrolled exhaust discharge, increases operator noise exposure, and can mask engine performance issues; this replacement restores proper exhaust flow and noise reduction.
• Operator Safety — A sound, properly sealed muffler directs exhaust gases away from the operator position, which is especially important on ride-on equipment where the operator sits in close proximity to the engine.

The muffler is a critical component of the engine exhaust system, responsible for reducing combustion noise and routing hot exhaust gases safely away from the machine and operator. On a large ride-on trowel like the HHXD5 or HHXG5, the muffler endures prolonged heat exposure and vibration during full-shift concrete finishing work. When the muffler cracks, corrodes, or loses its mounting integrity, exhaust leaks can increase noise levels, reduce engine efficiency, and create a hazard for the operator — making timely replacement essential to safe and productive troweling.

For help confirming fitment or to place an order, contact the DHS Equipment parts team directly.

Part Details

Compatibility & Fitment

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.