Multiquip SP3309A1 Suction Connection Pin and Groove Assembly

The Multiquip SP3309A1 Suction Connection Pin and Groove Assembly is a genuine OEM component designed for STOW Diaphragm Pump models SDP-2, CA90749, and SDP-3. As a factory-authorized part, it is manufactured to the exact tolerances and material specifications of the original, ensuring a secure and leak-free connection at the suction port. Confirm SP3309A1 against your pump's model and serial plate before ordering to ensure correct fitment across the SDP series.

Key Features

• OEM-Grade Connection Integrity — Manufactured to the original material and dimensional specifications that govern a sealed, pressure-rated suction connection — no compromise on joint security.
• Direct Drop-In Fit for SDP Series Pumps — Engineered to align precisely with the suction port housing on SDP-2, CA90749, and SDP-3 diaphragm pumps, matching the original pin and groove engagement points.
• Confirmed Fitment: SDP-2, CA90749, SDP-3 — Verified for STOW Diaphragm Pump models in the SDP series; always cross-reference your model plate with part number SP3309A1.
• Maintains Suction-Side Performance — A worn or damaged suction connection assembly allows air ingestion and pressure loss, reducing pump output and causing erratic priming. This replacement restores full suction capacity.
• Genuine Multiquip OEM Part — Sourced directly through the Multiquip parts network, ensuring the correct alloy grade and groove geometry for the original connection specification.

The suction connection pin and groove assembly is the mechanical fastening and sealing interface between the suction inlet plumbing and the pump body on a diaphragm pump. The pin locks the connection in place while the groove accepts a sealing element that prevents air from being drawn into the suction line — air ingestion is one of the most common causes of diaphragm pump priming failure and reduced flow. When this assembly wears, corrodes, or cracks, the pump loses its ability to generate consistent suction vacuum, resulting in poor prime, interrupted flow, and accelerated diaphragm wear.

Part Details

Compatibility & Fitment

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.