Multiquip 21218 Air Vent

The Multiquip 21218 Air Vent is a genuine OEM component designed for a wide range of Multiquip and Whiteman walk-behind and ride-on power trowel models, including the J36, JA, C, CA, B, and BA series as well as select ride-on trowel configurations. As a direct OEM replacement, the part is manufactured to the same specification as the original part, ensuring a correct, consistent installation across compatible trowel families. This part is confirmed to fit models including BH11C, BH90C, BS90C, JH55C, JH90C, B46, CA4HC, J36, PRO36, PRO46, and many additional walk-behind and ride-on units. Sourcing genuine OEM means you get the exact part your machine was built with, keeping it running as intended.

Key Features

• Genuine OEM Construction: — Manufactured to original equipment specification for consistent venting performance in trowel engine and gearbox applications.
• Direct-Fit Replacement: — Designed to seat and seal exactly as the factory-installed unit, with no trimming or adaptation needed during installation.
• Broad Trowel Compatibility: — Fits J36, JA, C, CA, B, and BA series walk-behind trowels plus select ride-on configurations including JTNS20HTCSL and JTNSW24HTCSL.
• Prevents Pressure Buildup: — Allows controlled airflow to equalize internal pressure, protecting seals and lubricants from contamination caused by pressure differential.
• Verified Part Number: — Multiquip 21218 matches across multiple Whiteman and international walk-behind trowel lines, reducing the risk of ordering errors on multi-unit fleets.

An air vent allows internal pressure within a gearbox or engine housing to equalize with the surrounding atmosphere, preventing the buildup of pressure that can force lubricants past seals and introduce contamination. On power trowels, where the gearbox operates under continuous rotational load, a correctly functioning air vent helps maintain seal integrity and extends the service life of internal components. A blocked or missing air vent can cause seal failure, oil leaks, and premature wear — making timely replacement an important part of routine trowel maintenance.

For fitment questions or order support, contact the DHS Equipment 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.