The Multiquip SP3306A1 Bottom Diaphragm is a genuine OEM replacement built for STOW Diaphragm Pump models SDP-2, SDP-3, and CA90749. Sourced directly from Multiquip, this part meets the exact material and dimensional standards of the original component installed at the factory. It is a direct drop-in replacement for worn or damaged diaphragms on compatible STOW pump units, restoring full pumping performance without guesswork.
Key Features
- OEM-Grade Diaphragm Material — Engineered to the same flex-fatigue resistance and chemical compatibility as the original, ensuring consistent seal integrity under continuous pumping cycles.
- Direct-Fit Installation — Matched to the exact bolt pattern and profile of the pump housing for straightforward installation on SDP-2, SDP-3, and CA90749 models.
- Confirmed Fitment — Verified for STOW Diaphragm Pump models SDP-2, SDP-3, and CA90749 within the Multiquip product line.
- Restores Full Pumping Capacity — A failed or cracked diaphragm causes loss of prime, reduced flow, and fluid bypass; replacing it with SP3306A1 returns the pump to full displacement output.
- Genuine Multiquip OEM Part — Backed by Multiquip's OEM supply chain, so you receive the correct specification every time.
The bottom diaphragm is a critical flexing membrane within the diaphragm pump assembly. It creates the alternating pressure and suction strokes that draw fluid in and push it out on each pump cycle. When this diaphragm cracks, hardens, or tears, the pump loses its ability to maintain prime, output volume drops sharply, and fluid can migrate into areas of the pump it should never reach. Replacing a worn bottom diaphragm with the correct OEM part is one of the most impactful service actions you can perform to keep a diaphragm pump running at rated capacity.
For fitment questions or to confirm compatibility with your specific unit, contact the DHS Equipment team for assistance.
Part Details
| Part Number | SP3306A1 |
|---|---|
| Brand | Multiquip |
| Part Type | Genuine OEM |
| Description | Bottom Diaphragm |
Compatibility & Fitment
| Name | Model |
|---|---|
| STOW Diaphragm Pumps | SDP-2 |
| STOW Diaphragm Pumps | SDP-3 |
| STOW Diaphragm Pumps | CA90749 |
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.
