The Multiquip EM50427 O-Ring A444 Wear ST80 is a genuine OEM sealing component designed for the ST80 swing tube concrete pump. As a direct OEM replacement, this o-ring is manufactured to the exact material composition and dimensional tolerances required for proper function in the ST80 pump assembly. Sourced directly through Multiquip's authorized parts network, EM50427 ensures you're installing the correct part the first time.
Key Features
- OEM-Grade Seal Material — Manufactured to the precise compound and durometer specification required for the high-pressure, abrasive environment inside a swing tube concrete pump.
- Exact-Fit Replacement — Dimensioned to match the ST80 pump's original o-ring groove geometry, allowing straightforward installation without modifications to the housing or adjacent components.
- ST80 Compatibility — Confirmed fitment for the Multiquip ST80 swing tube concrete pump series.
- Maintains Pumping Pressure — A correctly seated o-ring holds circuit pressure and prevents concrete slurry from bypassing the seal, keeping output consistent and protecting surrounding components from accelerated wear.
- Fuel and Fluid Integrity — Genuine OEM material selection resists degradation from the alkaline and abrasive properties of concrete mix, extending service life compared to non-specified substitutes.
An o-ring in a concrete pump serves as a pressurized seal between mating components, preventing fluid and slurry from leaking past critical junctions in the pumping circuit. In a swing tube design like the ST80, these seals are exposed to significant mechanical stress and abrasive material with every stroke, making material quality and dimensional accuracy essential. A worn or damaged o-ring allows pressure loss and slurry bypass, which reduces pump output, accelerates wear on surrounding components, and can lead to messy and costly leaks on the jobsite.
DHS Equipment is an authorized Multiquip parts dealer. If you have questions about fitment or need help confirming this is the correct part for your ST80, contact our parts team before ordering.
Part Details
| Part Number | EM50427 |
|---|---|
| Brand | Multiquip |
| Part Type | Genuine OEM |
| Description | O-Ring A444 Wear ST80 |
Compatibility & Fitment
| Name | Model |
|---|---|
| ST80 | ST80 |
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.
