The Multiquip EM16174 O-Ring is a genuine OEM sealing component designed for LS and ST series concrete pumps, including the LS300, LS300G, LS300GK, LS300P, LS400, LS40D, LS40TD, LS450, LS50TD, LS500, LS60TD, LS600, LS600P, and ST-45HRM and ST-70 models. As a direct OEM part, the part is manufactured to the exact material and dimensional specifications required by Multiquip, ensuring a proper seal without modification. Sourcing a genuine replacement keeps hydraulic and fluid circuits operating within designed pressure tolerances. DHS Equipment stocks this part to help you get your pump back in service quickly.
Key Features
- Genuine OEM Sealing Material — Manufactured to Multiquip's exact compound and durometer specifications for this pump series, not a generic substitute.
- Drop-In Fitment — Sized to seat correctly in the OEM groove without trimming, stretching, or shimming during installation.
- Broad LS and ST Series Compatibility — Confirmed fit across LS300, LS400, LS450, LS500, LS600, LS40D, LS40TD, LS50TD, LS60TD, and ST-series concrete pump models.
- Leak Prevention Where It Counts — A compromised O-Ring allows fluid bypass, pressure loss, and contamination that can damage pump internals; a correct replacement restores the sealed circuit immediately.
- Pressure-Circuit Integrity — Maintains the fluid boundary between high- and low-pressure zones in hydraulic concrete pump systems, protecting downstream components from overload.
An O-Ring is a loop-shaped seal that sits in a machined groove between two mating surfaces, compressing slightly when assembled to block the passage of fluid or air. In hydraulic-driven concrete pumps like the LS and ST series, O-Rings are used throughout the hydraulic circuit, valve bodies, and fluid connections to maintain pressure and prevent cross-contamination between circuits. When an O-Ring hardens, cracks, or is cut during disassembly, the result is a visible external leak or an internal bypass that causes sluggish pump response, pressure drop, and accelerated wear on hydraulic components downstream.
Part Details
| Part Number | EM16174 |
|---|---|
| Brand | Multiquip |
| Part Type | Genuine OEM |
| Description | O-Ring |
Compatibility & Fitment
| Name | Model |
|---|---|
| Mayco Pumps | LS600P |
| Mayco Pumps | LS300G |
| Mayco Pumps | LS300GK |
| Mayco Pumps | LS300P |
| Submersible Pumps | ST-45HRM |
| Submersible Pumps | ST-70 |
| Mayco Pumps | LS450 |
| Mayco Pumps | LS-40 |
| Mayco Pumps | LS40TD |
| Mayco Pumps | LS50TD |
| Mayco Pumps | LS60TD |
| Mayco Pumps | LS300 |
| Mayco Pumps | LS400 |
| Mayco Pumps | LS40D |
| Mayco Pumps | LS500 |
| Mayco Pumps | LS600 |
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.
