The Multiquip SP3353A1 Bottom Diaphragm is a genuine OEM replacement built for STOW diaphragm pump models SDP-3, SDP-2, and CA90749. Sourced directly through Multiquip's authorized parts network, this component meets the same specifications as the original part installed at the factory. It is a direct-fit replacement that installs without modification, making it the straightforward choice when servicing your diaphragm pump. DHS Equipment stocks this part to keep your pump back in service fast.
Key Features
- Genuine OEM Diaphragm Material: — Manufactured to the same flex-cycle durability and elastomer compound spec as the original, maintaining consistent pumping action under continuous load.
- Direct-Fit Bottom Position Replacement: — Engineered to seat correctly in the bottom diaphragm chamber, aligning with existing mounting points for a straightforward swap during routine service.
- Confirmed Fitment: — Verified for STOW diaphragm pump models SDP-3, SDP-2, and CA90749; always cross-reference part number SP3353A1 before ordering.
- Restored Flow Consistency: — A worn or cracked bottom diaphragm causes pressure loss, uneven flow, and fluid bypass; replacing it with this OEM part restores proper pumping output.
- Fluid Containment Integrity: — The diaphragm forms a critical seal between the fluid and mechanical chambers; using a correctly rated OEM replacement prevents cross-contamination and pump damage.
The bottom diaphragm is a core flexing membrane inside a diaphragm pump that moves fluid through the pump body by alternating expansion and contraction. Positioned in the lower chamber, it works in coordination with the top diaphragm to create the reciprocating action that draws fluid in and pushes it out with each stroke. When the diaphragm develops cracks, tears, or loses elasticity, the pump loses prime, output pressure drops, and fluid can migrate into areas of the pump it should never reach — leading to accelerated wear or complete pump failure. Replacing a fatigued diaphragm promptly is one of the most effective ways to extend overall pump service life.
For questions about fitment or to confirm this part is correct for your application, contact the DHS Equipment parts team before ordering.
Part Details
| Part Number | SP3353A1 |
|---|---|
| Brand | Multiquip |
| Part Type | Genuine OEM |
| Description | Bottom Diaphragm |
Compatibility & Fitment
| Name | Model |
|---|---|
| STOW Diaphragm Pumps | SDP-3 |
| STOW Diaphragm Pumps | CA90749 |
| STOW Diaphragm Pumps | SDP-2 |
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.
