The Multiquip SP3311N Flap Valve is a genuine OEM component designed for STOW Diaphragm Pumps, including the SDP-2, SDP-3, and CA90749 series. As a direct OEM replacement, this flap valve is manufactured to the same standards as the original part, ensuring a proper fit and consistent performance in your pump system. Verified fitment covers the SDP-2, SDP-3, and CA90749 STOW Diaphragm Pump models, so you can order with confidence knowing this is the correct part for your machine. DHS Equipment is your authorized source for Multiquip OEM parts — contact us to confirm fitment or check availability.
Key Features
- Genuine OEM Valve Construction — Manufactured to original material and dimensional specifications, ensuring consistent sealing performance under the pressure cycles typical of diaphragm pump operation.
- Direct Drop-In Replacement — Engineered to seat and seal the same way as the original valve, allowing straightforward swap-out during routine pump servicing.
- Confirmed Fitment — Compatible with STOW Diaphragm Pump models SDP-2, SDP-3, and CA90749 as verified OEM fitment data.
- Maintains Pump Flow Efficiency — A properly functioning flap valve ensures one-directional fluid flow through the pump body; a worn or failed valve causes backflow, loss of prime, and reduced output volume.
- Critical Seal Integrity — For a fluid-handling component, correct valve material and seating geometry directly affect leak prevention and operational safety when pumping liquids on the jobsite.
The flap valve is a one-way check valve seated within the pump body of a diaphragm pump. Its role is to control the direction of fluid flow — opening on the intake stroke to allow liquid in and closing on the discharge stroke to prevent backflow. When the flap valve wears, cracks, or loses its seating edge, the pump loses the ability to build and hold prime, resulting in reduced output, erratic flow, or a complete inability to move fluid. Replacing a damaged flap valve with a genuine OEM part like the SP3311N restores proper check-valve function and returns the pump to full operating capacity.
Part Details
| Part Number | SP3311N |
|---|---|
| Brand | Multiquip |
| Part Type | Genuine OEM |
| Description | Flap Valve |
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.
