Flapper Valve | PDT3A, PDT3

The Wacker Neuson is a genuine OEM Flapper Valve Gasket designed for the PDT and PDI series diaphragm pump models, including the PDT3A, PDT3, PDI3A, PDI3A(I), PDT2A, and PDI2A(I). As a direct genuine OEM part, the is manufactured to the same tolerances and material specifications as the original component, ensuring a consistent seal within the pump's valve assembly. This gasket is a critical service part for maintaining pump efficiency across multiple Wacker Neuson diaphragm pump configurations.

Key Features

• OEM-Grade Sealing Material — Manufactured to the original material and compression specification for the flapper valve seat, delivering consistent sealing performance under the cyclic pressure loads of a diaphragm pump.
• Direct Valve Assembly Fit — Designed to seat flush with the flapper valve housing, allowing straightforward installation without rework or shimming during pump servicing.
• Broad PDT and PDI Series Coverage — A single part number covers PDT3A, PDT3, PDI3A, PDI3A(I), PDT2A, and PDI2A(I) diaphragm pump models, consolidating your service parts inventory.
• Maintains Pump Output Integrity — A correctly sealed flapper valve prevents backflow and pressure loss across the pump's check valve circuit, preserving rated flow and discharge performance.
• Fuel and Chemical Resistance — Gasket material is suited to the fluid environments typical of diaphragm pump operation, resisting degradation from water, sludge, and mild chemicals encountered on site.

The flapper valve gasket seals the interface between the flapper valve and its seat within the pump's check valve assembly. In a diaphragm pump, the flapper valves control the one-way flow of fluid through the inlet and outlet ports — the gasket keeps each valve sealed against its seat during the pressure stroke, preventing fluid from bypassing back through the valve. When this gasket deteriorates or takes a compression set, the pump loses prime, output volume drops, and the machine may struggle to self-prime or sustain discharge pressure. Replacing a worn gasket with a genuine OEM part restores the original sealing geometry and gets the pump back to rated performance.

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.