The Multiquip EM505533 O-Ring is a genuine OEM seal designed for the ST-45HRM submersible pump. As a direct OEM replacement, this O-Ring is manufactured to the exact material and dimensional specifications required to maintain a proper, leak-free seal in your pump assembly. Verified for compatibility with the ST-45HRM, this part ensures the sealing surfaces mate correctly without modification. For operators and service technicians maintaining submersible pump equipment, using the correct OEM O-Ring is essential to avoiding seal failure and keeping the unit operating at full capacity.
Key Features
- OEM-Grade Seal Material — Manufactured to Multiquip's exact compound and durometer specifications, ensuring proper compression and long-term sealing performance in wet, pressurized environments.
- Drop-In Fitment — Dimensioned to seat correctly in the designed groove on the ST-45HRM pump assembly, allowing straightforward installation during routine service or rebuild.
- ST-45HRM Compatible — Confirmed fitment for the Multiquip ST-45HRM submersible pump series, so you can order with confidence.
- Leak Prevention — A correctly seated O-Ring maintains the internal pressure envelope of the pump housing; a worn or damaged O-Ring allows water ingress or fluid bypass that degrades pump output and can cause internal damage.
- Fluid System Integrity — In submersible pump applications, a compromised seal can allow contaminated water to reach internal components or allow pressure loss — making this a critical service item during any inspection or teardown.
An O-Ring is a precision-molded elastomeric seal that fits into a machined groove to create a watertight or pressure-tight barrier between two mating surfaces. In a submersible pump like the ST-45HRM, O-Rings are used at housing joints, shaft interfaces, and port connections to prevent water ingress and maintain the hydraulic integrity of the pump assembly. When an O-Ring ages, deforms, or is nicked during service, it loses its ability to compress evenly against the mating surface — resulting in leaks, loss of prime, or internal contamination that can lead to premature component failure.
Part Details
| Part Number | EM505533 |
|---|---|
| Brand | Multiquip |
| Part Type | Genuine OEM |
| Description | O-Ring |
Compatibility & Fitment
| Name | Model |
|---|---|
| Submersible Pumps | ST-45HRM |
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.
