Wacker Neuson 5000051451 Coupling 4 Plug Internal Thread Quick Disconnect

The Wacker Neuson Coupling 4 Plug Internal Thread Quick Disconnect is a genuine OEM component designed for the PS4 submersible pump series, the PTK4 pump kit, and the PT4A trash pump. As a direct-from-manufacturer part, is built to the exact dimensions and thread specifications required for a secure, leak-free connection in demanding pumping applications. This coupling covers an extensive range of PS4 variants including PS4-3703, PS4-5503, PS4-7503HH, PS4-7503HF, PS4-11003HH, and PS4-11003HF configurations across multiple voltage and frequency ratings. Ordering the correct OEM part number means you get the right internal thread profile and quick-disconnect mechanism the first time, keeping your pump back in service without guesswork.

Key Features

• Genuine OEM Thread Accuracy — Manufactured to the exact internal thread specification required for the PS4 discharge connection, ensuring a pressure-rated seal without modification.
• Quick-Disconnect Design — The integrated quick-disconnect mechanism allows fast coupling and uncoupling at the discharge port, saving time during setup, teardown, and hose swaps on site.
• Broad PS4 Series Coverage — Fits PS4-3703, PS4-5503, PS4-7503HH, PS4-7503HF, PS4-11003HH, PS4-11003HF, PSC4 series submersible pumps, the PTK4 pump kit, and the PT4A trash pump across 220 V, 440 V, 575 V, and 400 V/50 Hz configurations.
• Leak-Free Pump Performance — A properly seated coupling maintains full discharge pressure and flow rate; a worn or incorrectly threaded coupling causes pressure loss, reduced output, and potential hose blowoff under load.
• Fluid System Safety — Correct coupling engagement is critical in submersible and trash pump applications where pressurized discharge lines are in use — OEM thread and locking geometry ensures the connection holds under rated operating pressure.

The discharge coupling on a submersible or centrifugal pump is the mechanical interface between the pump's outlet port and the discharge hose or piping. It carries the full flow of pumped fluid under pressure, so thread integrity and the quick-disconnect locking mechanism must be matched precisely to the pump's port design. When this coupling is damaged, cross-threaded, or worn, the result is reduced discharge pressure, fluid leakage at the connection point, or complete hose separation — all of which interrupt pumping operations and can create safety hazards on the work site. Replacing it with the correct OEM part restores the rated connection strength and ensures the quick-disconnect releases and locks as intended.

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.