The Wacker Neuson is a genuine OEM Flapper Valve Gasket designed for the PDT3, PDT3A, PDI3, and PDI3A series 75mm/3in diaphragm trash pumps. Sourced directly from Wacker Neuson, this part meets the exact specifications of the original component installed at the factory. Compatible across multiple pump configurations including inline and standard diaphragm variants, the is the correct replacement when the flapper valve seal shows wear, cracking, or fluid bypass. Keep this gasket on hand to restore proper pump valve function and get your equipment back on the job without extended delays.
Key Features
- OEM Sealing Integrity — Manufactured to the same material grade and compression profile as the original, ensuring the flapper valve seats and seals correctly under pump operating pressure.
- Direct Drop-In Replacement — Matches the original gasket geometry for the flapper valve assembly, allowing straightforward installation without trimming or modification.
- Broad PDT/PDI Series Compatibility — Fits PDT3, PDT3A, PDI3, and PDI3A 75mm/3in diaphragm trash pumps across multiple machine configurations and serial ranges.
- Restores Full Pumping Efficiency — A deteriorated flapper valve gasket allows backflow past the valve, reducing output pressure and flow rate; replacing it brings pump performance back to spec.
- Fluid-Path Critical Component — Located in the pump's valve system, this gasket directly affects the pump's ability to move fluid safely and efficiently — making correct part selection essential for dependable operation.
The flapper valve gasket forms the sealing interface between the flapper valve and its seat within a diaphragm pump's check valve assembly. In operation, the flapper valve opens and closes with each stroke of the diaphragm to direct fluid flow in one direction and prevent backflow. The gasket ensures this valve seals fully on the return stroke — without it, fluid bleeds back through the valve, causing a measurable drop in discharge pressure and overall pump output. When the gasket hardens, cracks, or deforms from prolonged exposure to fluid and heat, the pump will appear to run but deliver significantly less flow, making timely replacement critical to keeping the pump working as intended.
Part Details
| Part Number | 5000051301 |
|---|---|
| Old Part Number | 0051301 |
| Brand | Wacker Neuson |
| Part Type | Genuine OEM |
| Description | Flapper Valve Gasket |
Compatibility & Fitment
| Name | Model | Machine Number |
|---|---|---|
| 75mm/3in Diaphragm Trash Pump | PDT3A | 5000007614, 5000007615, 5000007616 |
| 75mm/3in Inline Diaphragm Tras h Pump | PDI3A | 5000007628, 5000007629, 5000009407 |
| 75mm/3in Diaphragm Trash Pumps | PDT3 | 5000009495, 5000007619 |
| 75mm/3in Diaphragm Pump | PD3B | 5000006802 |
| 75mm/3in Diaphragm Trash Pump | PDI3 | 5000009491, 5000009492 |
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.
Wacker Neuson
3" Pump Diaphragm & Flapper Kit | Wacker PDI3, PDI3A, PDT3, PDT3A
