The Multiquip 2021838 is a genuine OEM 1/8" x 3/8" Spring Pin designed for STOW and MQ diaphragm pump models including SDP-3, SDP-2, CA90749, and MQ-D206H. As an authentic Multiquip OEM component, this spring pin is manufactured to the exact dimensions and material specifications required for proper function in these diaphragm pump assemblies. Sourced directly through authorized Multiquip supply channels, the part is a direct replacement that installs without modification. Keep one on hand to minimize unplanned service interruptions on the job.
Key Features
- Genuine OEM Dimensional Accuracy — Manufactured to the precise 1/8" x 3/8" specification required for correct engagement and retention in diaphragm pump assemblies.
- Drop-In Replacement — Matches the original pin profile exactly, seating into existing bores on compatible models without any rework or fitting adjustments.
- Broad Diaphragm Pump Compatibility — Confirmed fit for STOW diaphragm pump models SDP-3, SDP-2, and CA90749, as well as MQ diaphragm pump model MQ-D206H.
- Retention Under Load — Spring pins are designed to flex and grip within their bore, maintaining secure component retention even under the cyclic pressure and vibration typical of diaphragm pump operation.
- Fast Serviceability — A small fastener with a big impact; replacing a worn or sheared spring pin restores proper component alignment and prevents further mechanical damage downstream.
A spring pin — also called a roll pin or slotted spring pin — is a small cylindrical fastener with a lengthwise slot that allows it to compress as it is driven into a bore, then spring outward to grip the surrounding material. In diaphragm pump assemblies, spring pins are commonly used to secure levers, linkages, and pivot components in precise alignment. When a spring pin shears or works loose, connected components can shift out of position, leading to erratic pump performance, accelerated wear on adjacent parts, or a loss of pumping function entirely. Replacing a damaged pin promptly with the correct OEM part restores the mechanical relationship between components and protects the integrity of the surrounding assembly.
Part Details
| Part Number | 2021838 |
|---|---|
| Brand | Multiquip |
| Part Type | Genuine OEM |
| Description | 1/8" x 3/8" Spring Pin |
Compatibility & Fitment
| Name | Model |
|---|---|
| STOW Diaphragm Pumps | SDP-3 |
| STOW Diaphragm Pumps | CA90749 |
| MQ Diaphragm Pumps | MQ-D206H |
| STOW Diaphragm Pumps | SDP-2 |
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.
