The Multiquip ST6125D0604 is a genuine OEM O-Ring Dia. 3.1/135 designed for ST6125D and ST4125D series submersible clean water pumps. As a direct OEM replacement, this o-ring is manufactured to exact dimensional and material specifications, ensuring a proper compression fit at its sealing point. Verified fitment covers the ST6125D and ST4125D Multiquip submersible pump models.
Key Features
- Exact OEM Sealing Specification — Manufactured to the precise 3.1/135 diameter profile required for a correct compression seal, preventing bypass and fluid ingress at the mating surfaces.
- Direct Drop-In Replacement — Seats into the original groove without adjustment, maintaining the correct cross-section compression for a leak-free installation.
- Confirmed Submersible Pump Fitment — Compatible with Multiquip ST6125D and ST4125D clean water submersible pump models.
- Protects Pump Integrity — A correctly seated o-ring keeps water from breaching internal pump housings; a failed or worn o-ring can cause seal leakage, loss of prime, and internal component damage.
- Fluid-System Safety — Maintaining a sound o-ring seal in a submersible pump is essential for preventing uncontrolled water ingress into electrical and mechanical pump internals, supporting safe operation.
An o-ring is a circular elastomeric seal that sits within a machined groove between two mating components, creating a pressure-tight barrier that prevents fluid from passing through the joint. In a submersible pump, o-rings are critical to keeping water out of housings, motor cavities, and connection points where it would cause corrosion or electrical failure. When an o-ring becomes brittle, compressed flat, or cracked, it loses its ability to form a proper seal, leading to leaks, reduced pump performance, and potential damage to internal components.
For help confirming this part fits your specific unit, contact the DHS Equipment team with your model and serial number.
Part Details
| Part Number | ST6125D0604 |
|---|---|
| Brand | Multiquip |
| Part Type | Genuine OEM |
| Description | O-Ring Dia. 3.1/135 |
Compatibility & Fitment
| Name | Model |
|---|---|
| MQ Submersible Pumps Clean Water | ST6125D |
| MQ Submersible Pumps Clean Water | ST4125D |
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.
