The Multiquip 178900000 Flat Washer 1/4" is a genuine OEM component designed for MQD2HA and MQD3HA diaphragm pumps. Sourced directly from Multiquip, this washer meets the exact dimensional and material standards required for correct installation and lasting service. Part number 178900000 is the verified replacement for these pump models, giving you confidence in fitment before you order. Whether you're completing a routine service or addressing wear, this OEM washer ensures the assembly goes back together as it left the factory floor.
Key Features
- OEM-Grade Material Consistency — Manufactured to Multiquip's exact thickness and hardness specifications, ensuring the washer seats and distributes load correctly across fastened joints.
- Direct Drop-In Installation — Sized to 1/4" to match the existing hardware configuration on MQD2HA and MQD3HA pumps — installs with standard hand tools, no rework needed.
- Confirmed Fitment for MQD2HA and MQD3HA — Verified genuine OEM fitment for Multiquip MQD2HA and MQD3HA diaphragm pump models.
- Proper Clamp Load Distribution — A correctly sized flat washer spreads fastener load evenly across the mating surface, protecting threaded connections and pump housing components from stress cracking or premature wear.
- Genuine OEM Part — Supplied as an authentic Multiquip replacement under part number 178900000, not a generic substitute — critical for assemblies where dimensional accuracy directly affects sealing and structural integrity.
A flat washer serves as a load-distributing interface between a fastener — such as a bolt head or nut — and the surface it clamps against. In diaphragm pump assemblies, washers play an important role in maintaining consistent clamping force across covers, housings, and fluid-path components where leakage prevention depends on uniform surface contact. When a washer is undersized, deformed, or missing, fasteners can pull through soft surfaces, torque values become unreliable, and fluid seals may fail prematurely. Using the correct OEM-spec washer keeps every bolted joint in the pump assembly performing as designed.
For questions about fitment or to confirm this is the right part for your machine, contact the DHS Equipment team.
Part Details
| Part Number | 178900000 |
|---|---|
| Brand | Multiquip |
| Part Type | Genuine OEM |
| Description | Flat Washer 1/4" |
Compatibility & Fitment
| Name | Model |
|---|---|
| Diaphragm Pumps | MQD2HA |
| Diaphragm Pumps | MQD3HA |
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.
