The Multiquip 21320-001 3-Inch Diaphragm is a genuine OEM replacement component designed for MQD2H and MQD3H diaphragm pumps. As an authorized Multiquip OEM part, 21320-001 is manufactured to the same specifications as the original, ensuring a direct, trouble-free installation. This diaphragm is a critical wear item in pump operation, and having the correct OEM replacement on hand keeps your pump running at full capacity. Confirm your model code before ordering — this part is verified for MQD2H and MQD3H applications.
Key Features
- Genuine OEM Material Integrity — Manufactured from the same flexible, chemical-resistant diaphragm material as the original, maintaining proper flex cycle life and fluid containment performance.
- Direct Drop-In Replacement — Engineered to bolt directly into the pump housing without rework, matching the original bolt pattern, diameter, and thickness of the factory diaphragm.
- Verified Fitment for MQD2H and MQD3H — Confirmed for Multiquip MQD2H and MQD3H diaphragm pump models, so you can order with confidence.
- Restores Full Pump Output — A worn or cracked diaphragm causes loss of prime, reduced flow rate, and fluid bypass; replacing with 21320-001 restores rated pumping performance.
- Fluid Containment Safety — A compromised diaphragm can allow pumped fluid to migrate into the air chamber, creating leak hazards; the OEM diaphragm maintains proper barrier integrity between fluid and mechanical components.
The diaphragm is the heart of a diaphragm pump, flexing back and forth to draw fluid in through the inlet valve and push it out through the discharge valve with each stroke. Over time, repeated flexing, abrasion from solids in suspension, and chemical exposure cause the diaphragm to crack, stiffen, or develop pinholes — resulting in a loss of suction, reduced flow, or complete pump failure. Replacing the diaphragm with a properly spec'd OEM part restores full pumping efficiency and prevents cross-contamination between the fluid and air sides of the pump.
Part Details
| Part Number | 21320-001 |
|---|---|
| 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.
