The Multiquip 100KDO75324 is a genuine OEM O Ring Hose Connection ST-4125 designed for the Multiquip ST-4125 concrete pump. As a direct OEM replacement, this seal is manufactured to the exact material and dimensional specifications required by the ST-4125, ensuring a proper seat and leak-free connection at the hose interface. Sourced directly from Multiquip, part 100KDO75324 delivers the same fit and sealing performance as the original component your machine left the factory with. If you are servicing or rebuilding the hose connection on your ST-4125, this is the correct replacement seal to use.
Key Features
- OEM-Grade Seal Material — Manufactured to the precise compound and durometer spec required for concrete pump hose connections, maintaining compression and sealing integrity under pressure.
- Direct Hose Connection Fit — Seats correctly in the hose connection port of the ST-4125 without modification, restoring the original sealing surface.
- ST-4125 Specific — Confirmed fitment for the Multiquip ST-4125 swing-tube concrete pump; use part number 100KDO75324 to verify against your machine's parts diagram.
- Leak Prevention at the Source — A worn or degraded O-ring at the hose connection allows slurry or hydraulic fluid to escape the circuit, reducing pump output and creating a mess on site — this replacement restores the seal.
- Genuine Multiquip OEM Part — Supplied as an authentic Multiquip component, ensuring the seal profile and material meet the original design intent for the ST-4125 pump platform.
An O-ring at a hose connection acts as the primary pressure seal between two mating surfaces, preventing fluid or slurry from escaping the circuit at that joint. In a concrete pump like the ST-4125, this seal is exposed to the abrasive and pressurized flow of concrete mix, making material integrity and correct sizing critical. When the O-ring deteriorates — through compression set, chemical degradation, or physical wear — the connection weeps or leaks outright, which can drop pump efficiency and create unsafe working conditions around the machine.
Part Details
| Part Number | 100KDO75324 |
|---|---|
| Brand | Multiquip |
| Part Type | Genuine OEM |
| Description | O Ring Hose Connection ST-4125 |
Compatibility & Fitment
| Name | Model |
|---|---|
| ST-4125 | ST-4125 |
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.
