The Multiquip ST4125D0504 is a genuine OEM O-Ring Dia.35x232 designed for ST4125D and ST6125D series clean water submersible pumps. As an authentic Multiquip replacement, this O-ring is manufactured to exact dimensional and material specifications, ensuring a proper compression seal in your pump assembly. Confirm your model code against ST4125D and ST6125D before ordering to ensure direct fitment.
Key Features
- Genuine OEM Sealing Material: — Produced to exact compound and durometer specs for submersible pump service, maintaining correct compression and fluid resistance under continuous water exposure.
- Exact Dimensional Match: — Dia.35x232 sizing corresponds directly to the seating groove in the pump housing, allowing the O-ring to seat and compress correctly without shimming or modification.
- Confirmed Fitment: — Verified for ST4125D and ST6125D Multiquip clean water submersible pump models.
- Leak Prevention: — A correctly seated O-ring prevents water ingress into sealed chambers and stops internal fluid bypass that can reduce pump output pressure and flow rate.
- Service and Rebuild Ready: — A critical replacement item during pump disassembly, inspection, or seal replacement intervals to restore original watertight integrity.
An O-ring is a circular elastomeric seal that sits within a machined groove between two mating surfaces, creating a pressure-tight barrier that prevents fluid from leaking past the joint. In a submersible pump, O-rings are essential for isolating the motor cavity from the pumped fluid and for sealing housing sections against internal pressure. When an O-ring becomes worn, cracked, or deformed, the seal fails — allowing water to bypass intended flow paths or enter sealed motor compartments, which can result in loss of pump efficiency or internal damage.
Part Details
| Part Number | ST4125D0504 |
|---|---|
| Brand | Multiquip |
| Part Type | Genuine OEM |
| Description | O-Ring Dia.35x232 |
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.
