The Multiquip 335407090 is a genuine OEM Check Valve Neoprene Assembly Kit, 3-Inch, designed for MQD2HA, MQD3HA, MQD2H, and MQD3H diaphragm pumps. As a factory-sourced assembly kit, 335407090 delivers the correct neoprene grade and valve geometry to restore proper flow control in Multiquip diaphragm pump applications. This kit includes the components needed to complete a full check valve service, keeping your pump operating at rated capacity. Verify your pump model against the fitment list before ordering to ensure compatibility.
Key Features
- Genuine OEM Neoprene Grade — Factory-specified neoprene compound ensures the correct flexibility and chemical resistance for diaphragm pump fluid handling, not a general-purpose substitute.
- Complete Assembly Kit — Supplied as a ready-to-install kit with all required check valve components, allowing a full valve service in a single order.
- 3-Inch Valve Sizing — Sized specifically for the 3-inch fluid port on compatible Multiquip diaphragm pumps; installs directly without additional adaptation.
- Fits MQD2H and MQD3H Series — Confirmed fitment for MQD2HA, MQD3HA, MQD2H, and MQD3H diaphragm pump models.
- Restores Full Flow Performance — A worn or damaged check valve allows backflow, reducing output pressure and pump efficiency; replacing with a correct OEM kit restores designed pumping capacity.
- Fluid System Integrity — Proper check valve seating prevents reverse flow that can damage the diaphragm and internal pump components, protecting the broader pump assembly.
A check valve in a diaphragm pump controls the direction of fluid movement through the pump body, opening on the pressure stroke to allow fluid through and seating firmly on the return stroke to prevent backflow. In a 3-inch diaphragm pump, the check valve assembly must maintain a reliable seal under repeated cycling to sustain consistent output volume and pressure. When the neoprene valve seat wears, cracks, or loses its seating surface, the pump loses prime, output drops, and the diaphragm is subjected to increased stress — accelerating wear across the entire fluid end of the pump.
Part Details
| Part Number | 335407090 |
|---|---|
| Brand | Multiquip |
| Part Type | Genuine OEM |
| Description | Check Valve Neoprene Assembly Kit 3-Inch |
Compatibility & Fitment
| Name | Model |
|---|---|
| Diaphragm Pumps | MQD2HA |
| Diaphragm Pumps | MQD3HA |
| Diaphragm Pumps | MQD2H |
| Diaphragm Pumps | MQD3H |
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.
Multiquip
Multiquip 336007090 Check Valve Neoprene Assembly Kit 2-Inch
