The Multiquip ST4125D0604 O-Ring Dia. 3.1/135 is a genuine OEM sealing component designed for ST4125D and ST6125D clean water submersible pumps. As a direct OEM replacement, this o-ring is manufactured to the exact material and dimensional specifications required by Multiquip, ensuring a proper seal within the pump assembly. Confirmed fitment covers ST4125D and ST6125D series submersible pumps. Sourced directly through authorized distribution channels, this part carries the confidence of genuine Multiquip quality.
Key Features
- OEM-Grade Sealing Material — Manufactured to the precise elastomer compound and compression specification required for submersible pump service, ensuring consistent sealing performance under continuous water exposure.
- Exact Dimensional Match — The Dia. 3.1/135 sizing is specific to the pump housing groove it seats in, allowing direct installation without any modification to the mating surfaces.
- Confirmed Fitment — Compatible with ST4125D and ST6125D Multiquip clean water submersible pump models.
- Prevents Pump Leakage — A correctly seated o-ring maintains the internal pressure boundary of the pump; a worn or damaged o-ring allows water ingress or bypass, leading to loss of pump output and potential motor damage.
- Genuine Multiquip OEM Part — Supplied as an official replacement under part number ST4125D0604, traceable through authorized Multiquip distribution for verified part authenticity.
An o-ring is a precision sealing element that sits within a machined groove between two mating surfaces in the pump housing. Its role is to create a pressure-tight barrier that prevents water from bypassing critical internal components or escaping the pump assembly entirely. When an o-ring degrades — through compression set, cracking, or swelling from chemical exposure — the seal fails, causing leaks that reduce pump efficiency and can allow moisture to reach the motor, resulting in premature failure. Replacing a worn o-ring promptly with the correct OEM part restores the pump's sealed integrity and protects the broader assembly.
Part Details
| Part Number | ST4125D0604 |
|---|---|
| Brand | Multiquip |
| Part Type | Genuine OEM |
| Description | O-Ring Dia. 3.1/135 |
Compatibility & Fitment
| Name | Model |
|---|---|
| MQ Submersible Pumps Clean Water | ST4125D |
| MQ Submersible Pumps Clean Water | ST6125D |
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.
