The Multiquip 21320 3-Inch Diaphragm is a genuine OEM replacement diaphragm designed for MQD2H and MQD3H diaphragm pumps. As a factory-sourced component, it meets the exact material and dimensional specifications required for proper pump operation. This part is a direct replacement for the original diaphragm on compatible Multiquip pump models, making it the correct choice for scheduled maintenance or field repairs. Confirm your model code against MQD2H and MQD3H fitment before ordering to ensure a correct match.
Key Features
- Genuine OEM Diaphragm Material — Manufactured to Multiquip's original compound and thickness specifications, ensuring the flex-and-seal cycle performs as intended across the full pressure range of the pump.
- Drop-In Replacement — Engineered to mount directly to the pump housing using the original bolt pattern, so disassembly and reassembly follow the standard service procedure without rework.
- Confirmed Fitment for MQD2H and MQD3H — Verified for Multiquip MQD2H and MQD3H diaphragm pump models; always cross-reference your model code before installation.
- Restores Full Flow Capacity — A worn or cracked diaphragm causes loss of prime, reduced output, and fluid bypass; replacing it with part 21320 restores the pump's rated transfer performance.
- Fluid Containment Integrity — In diaphragm pump applications, a compromised diaphragm can allow pumped media to contact internal drive components; a fresh OEM diaphragm maintains the critical separation barrier between the fluid chamber and the mechanical side of the pump.
The diaphragm is the primary pumping element in a diaphragm-style transfer pump. It flexes back and forth inside the pump housing, creating the pressure differential that draws fluid in through the inlet valve and pushes it out through the discharge valve. Because it flexes thousands of times per minute under load, the diaphragm is a wear item — over time the material fatigues, cracks, or loses elasticity, leading to a loss of prime, reduced flow, or complete pump failure. Replacing the diaphragm at the first sign of performance drop is the most cost-effective way to restore the pump to full working condition.
Part Details
| Part Number | 21320 |
|---|---|
| Brand | Multiquip |
| Part Type | Genuine OEM |
| Description | 3-Inch Diaphragm |
Compatibility & Fitment
| Name | Model |
|---|---|
| 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.
