The Multiquip 21348 Fitting Plug 10MO Hex is a genuine OEM component designed for STX55Y6 and STX55J6 hydrostatic ride-on power trowels. As an authorized Multiquip parts source, DHS Equipment supplies this part direct — so you can be confident you're getting the exact plug specified for your machine. The 21348 is a direct-fit replacement that installs to OEM specification, keeping your hydraulic circuit sealed and your trowel operating as designed.
Key Features
- Genuine OEM Construction — Manufactured to Multiquip's exact thread form and hex dimensions, ensuring a secure, leak-free seal in the hydraulic or fluid circuit port.
- Direct Port Fit — Sized specifically for 10MO metric male thread ports, threading in without adaptation to the correct torque specification.
- Confirmed Fitment — Verified for STX55Y6 and STX55J6 super-sized hydrostatic ride-on trowels.
- Hydraulic Circuit Integrity — A correctly installed plug cap seals unused or service ports, preventing fluid loss and maintaining system pressure for consistent blade pitch and drive response.
- Verified Part Number — Order by Multiquip part number 21348 to ensure you receive the exact plug for your STX55 series machine.
A plug fitting is used to seal an open or unused port in a hydraulic or fluid system. On hydrostatic ride-on trowels like the STX55 series, maintaining a fully sealed hydraulic circuit is essential — any unsealed port can bleed pressure from the system, leading to sluggish or inconsistent blade pitch control and drive performance. A worn, damaged, or missing plug fitting allows fluid to escape, which can cause pressure drop across the hydraulic circuit and result in uneven trowel blade response or loss of drive function until the port is properly sealed.
For assistance confirming fitment or placing your order, contact the DHS Equipment parts team.
Part Details
| Part Number | 21348 |
|---|---|
| Brand | Multiquip |
| Part Type | Genuine OEM |
| Description | Fitting Plug 10MO Hex |
Compatibility & Fitment
| Name | Model |
|---|---|
| Whiteman Ride-On Power Trowels | STX55Y6 |
| Whiteman Ride-On Power Trowels | STX55J6 |
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.
