The Multiquip ST4125D025 is a genuine OEM Mechanical Seal designed for ST4125D and ST6125D clean water submersible pumps. As an authorized Multiquip replacement part, it is manufactured to the same specifications as the original component, ensuring a correct fit without modification. This seal is confirmed compatible with MQ Submersible Pumps Clean Water series models ST4125D and ST6125D, making it a straightforward service part for operators maintaining these units in the field or shop.
Key Features
- Genuine OEM Sealing Integrity — Manufactured to original material and dimensional specs, ensuring the correct compression and face-contact rating required to maintain a water-tight shaft seal in submersible pump applications.
- Direct Drop-In Replacement — Engineered to install in the same seat and shaft position as the original seal, restoring pump integrity without rework or custom fitting.
- Confirmed Fitment for ST4125D and ST6125D — Verified for use on Multiquip ST4125D and ST6125D clean water submersible pump models.
- Prevents Shaft and Motor Damage — A functioning mechanical seal keeps water from migrating up the pump shaft into the motor housing; a worn or failed seal can allow moisture ingress that leads to motor failure and costly repairs.
- Critical for Leak-Free Operation — In submersible pump service, the mechanical seal is the primary barrier between the pumped fluid and internal drive components — using the correct OEM replacement maintains that barrier at the designed performance level.
A mechanical seal in a submersible pump creates a rotating, pressure-resistant barrier between the impeller shaft and the motor housing, preventing the pumped liquid from traveling up the shaft and reaching internal electrical and mechanical components. It consists of two precision-lapped faces — one rotating with the shaft and one stationary — that maintain continuous contact to block fluid passage. When a mechanical seal wears or cracks, the pump will begin to leak around the shaft, and if left unaddressed, water intrusion into the motor can cause complete motor failure, making timely seal replacement one of the most important routine service tasks on any submersible pump.
Part Details
| Part Number | ST4125D025 |
|---|---|
| Brand | Multiquip |
| Part Type | Genuine OEM |
| Description | Mechanical Seal |
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.
