The Multiquip 0204102135 Ring Seal ST-4100 is a genuine OEM ring seal designed for the ST-4100 swing tube concrete pump. As a direct OEM replacement sourced through Multiquip's authorized parts program, this seal is built to the exact material and dimensional specifications required by the ST-4100. Keeping the correct seal in place is critical to maintaining system pressure and preventing concrete slurry from bypassing the pump's sealing surfaces. If you're servicing an ST-4100 and need a dependable, specification-correct replacement, the part is the part to reach for.
Key Features
- OEM Material Specification — Manufactured to the exact compound and hardness grade required for the ST-4100's pumping environment, where resistance to abrasive slurry and hydraulic pressure is essential.
- Drop-In ST-4100 Fitment — Engineered to seat correctly within the ST-4100 swing tube concrete pump's sealing interface with no rework or modification to the housing.
- Confirmed ST-4100 Compatibility — Verified fitment for the Multiquip ST-4100 concrete pump, so you can order with confidence against your machine's model code.
- Leak Prevention Under Pressure — A correctly seated ring seal maintains the pressure differential needed for consistent concrete flow; a worn or cracked seal allows bypass, reducing output and contaminating surrounding components.
- Genuine OEM Sourcing — Supplied as an authentic Multiquip OEM component, meaning the geometry, cross-section, and material grade match the original production seal exactly — not approximated.
A ring seal in a concrete pump serves as the pressure boundary between moving and stationary components, preventing concrete slurry from escaping the pumping circuit. In swing tube pump designs like the ST-4100, the seal must withstand both abrasive aggregate contact and cyclic hydraulic loading every time the swing tube changes direction. When a ring seal deteriorates, operators typically notice a drop in output pressure, visible material leakage at the seal interface, or inconsistent concrete delivery — all of which point to a seal that needs immediate replacement to restore the pump to full working order.
For questions about fitment or to confirm this is the correct seal for your ST-4100, contact the DHS Equipment parts team before ordering.
Part Details
| Part Number | 0204102135 |
|---|---|
| Brand | Multiquip |
| Part Type | Genuine OEM |
| Description | Ring Seal ST-4100 |
Compatibility & Fitment
| Name | Model |
|---|---|
| ST-4100 | ST-4100 |
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.
