2″ CH&E Replacement Diaphragm – Neoprene
The 2 Inch CH&E Neoprene Replacement Diaphragm is a replacement wear part for select CH&E 5400 and 6400 Series diaphragm pumps. The CH&E parts manual lists diaphragm reference P2331 for these 2 inch pump series. This product is the neoprene material option. Before ordering, check the pump model and serial number, compare the old diaphragm, and confirm the required material. Ken’s Distributing can help review your pump tag, original part reference, and measurements to confirm fit.
Key Product Highlights
- Replacement diaphragm for select 2 inch CH&E pumps
- Neoprene diaphragm material
- CH&E parts-manual reference P2331
- Listed for CH&E 5400 and 6400 Series pumps
- Check the pump model and serial number before ordering
- Compare the old diaphragm and measurements before purchase
- Contact Ken’s Distributing for fitment help
Product Specifications
| Specification | Product Information |
|---|---|
| Product Type | Replacement pump diaphragm |
| Pump Brand | CH&E |
| CH&E Parts-Manual Reference | P2331 |
| Nominal Pump Size | 2 inch |
| Diaphragm Material | Neoprene |
| Verified Pump Series | CH&E 5400 and 6400 Series |
| Models to Check | 5401, 5402, 5403, 5405, 6401, 6402, 6403, and 6405 |
| Pump Assembly Quantity | One diaphragm is shown in the CH&E pump assembly |
| Fitment Requirement | Confirm the pump model, serial number, original part reference, material, and diaphragm measurements |
About the 2 Inch CH&E Neoprene Replacement Diaphragm
The 2 Inch CH&E Neoprene Replacement Diaphragm is made for select 2 inch CH&E diaphragm pumps in the 5400 and 6400 Series. These pump series use the diaphragm listed as reference P2331 in the CH&E parts manual.
This product is made from neoprene. Do not order from the pump brand and port size alone. Check the full pump model, serial number, original part reference, material, and diaphragm measurements before placing an order.
CH&E Part Reference P2331
The CH&E parts table lists P2331 as the diaphragm reference for both the aluminum 5400 Series and cast-iron 6400 Series 2 inch pumps. The manual does not list a separate neoprene suffix in the main parts table.
Use P2331 as a parts-manual reference when checking your pump. Also confirm that the neoprene material and physical dimensions match the diaphragm being replaced.
CH&E Pump Compatibility
The manufacturer parts information covers CH&E 5400 and 6400 Series 2 inch diaphragm pumps. Models connected with these series may include:
- CH&E 5401
- CH&E 5402
- CH&E 5403
- CH&E 5405
- CH&E 6401
- CH&E 6402
- CH&E 6403
- CH&E 6405
Production versions and previous repairs may affect fitment. Check the model and serial number on the pump tag before ordering. Additional CH&E models may require separate verification.
How to Confirm the Correct Fit
- Find the model and serial-number tag on the CH&E pump.
- Confirm that the pump is part of the 2 inch 5400 or 6400 Series.
- Check the parts manual or an old order record for diaphragm reference P2331.
- Confirm that neoprene is the required diaphragm material.
- Remove and inspect the old diaphragm when possible.
- Compare the outside diameter, center section, height, outer edge, and mounting points.
- Contact Ken’s Distributing when any fitment detail is unclear.
When requesting fitment help, provide a clear photo of the pump tag, both sides of the old diaphragm, any visible part numbers, and the main diaphragm measurements.
Pump Size and Diaphragm Measurements
The 2″ description refers to the pump’s nominal suction and discharge connection size. It does not mean that the diaphragm measures two inches across.
The diaphragm is a larger formed part installed inside the pump. Compare these details before ordering:
- Outside diameter
- Center-section diameter
- Overall diaphragm height
- Center-hole design
- Outer-edge shape
- Mounting-hole pattern
- Any molded or printed part markings
Do not use pump size or product appearance as the only fitment check.
Confirm the Diaphragm Material
This product listing is for a neoprene diaphragm. Confirm that neoprene matches the original part or the material selected for the fluid being pumped.
CH&E pump parts may be available in materials such as neoprene, rubber, TPE, Buna-N, or Viton. These materials should not be treated as interchangeable for every pumping application. Confirm the required material before changing from the diaphragm previously installed in the pump.
When to Inspect the Pump Diaphragm
Inspect the diaphragm when the pump has trouble priming, loses normal pumping capacity, or shows a visible break or leak. These symptoms do not always mean that the diaphragm is the only worn part.
Suction hose leaks, worn flap valves, poor sealing surfaces, and loose connections can cause similar problems. Inspect the full pump fluid path before replacing one component.
Related Parts to Inspect
When the pump is open for diaphragm service, also inspect:
- Inlet and outlet flap valves
- Diaphragm bottom plate
- Water-box sealing surface
- Mounting bolts and hardware
- Connecting rod components
- Suction and discharge hoses
- Hose clamps and connection seals
A damaged valve or poor sealing surface may continue to cause priming or flow problems after the diaphragm has been replaced.
Installation Preparation
Shut down the pump and follow the service instructions for the exact CH&E pump model and drive type. Confirm that the pump cannot start while service work is being completed.
Clean the diaphragm mounting area before installing the replacement. Center the diaphragm carefully and tighten the outer fasteners in an even crossing pattern. Use the torque values and service procedure listed for the exact pump model. Do not apply a torque value from a different pump version.
Get Fitment Help from Ken’s Distributing
Contact Ken’s Distributing before ordering if the pump tag is hard to read, the old diaphragm has no visible number, the measurements do not match, or the pump may have been modified during an earlier repair.
For faster fitment help, provide:
- Pump model
- Pump serial number
- Photo of the pump identification tag
- Photos of both sides of the old diaphragm
- Any number printed or molded on the old part
- Outside and center measurements
- Required diaphragm material
Related CH&E Diaphragms and Repair Parts
- 2 Inch CH&E Rubber Replacement Diaphragm
- 2 Inch CH&E TPE Replacement Diaphragm
- 3 Inch CH&E Neoprene Replacement Diaphragm
- CH&E 5400 and 6400 Pump Repair Parts
- Neoprene Replacement Diaphragms
Frequently Asked Questions
Does this diaphragm fit every 2 inch CH&E pump?
No. The 2 inch CH&E Neoprene Replacement Diaphragm should not be treated as a universal part for every CH&E pump with 2 inch ports. The manufacturer parts information covers the CH&E 5400 and 6400 Series. Check the pump’s full model and serial number. Also compare the old diaphragm, material, part reference, and measurements. Send Ken’s Distributing a photo of the pump tag when the model is unclear.
What part number should I compare before ordering?
Compare your pump parts manual or old order record with CH&E diaphragm reference P2331. The CH&E 5400 and 6400 Series parts table lists P2331 as the diaphragm. The table does not show a separate neoprene suffix. Confirm that the replacement is neoprene and that the dimensions match your old diaphragm before ordering. Do not rely on the part reference without also checking the pump model and serial number.
Which CH&E pump models may use this diaphragm?
The verified manufacturer coverage is the 2 inch CH&E 5400 and 6400 Series. Models connected with these series may include 5401, 5402, 5403, 5405, 6401, 6402, 6403, and 6405. Use this model list as a fitment starting point rather than a universal guarantee. Always check the full model, serial number, original part reference, diaphragm material, and physical measurements before placing an order.
Is the 2″ pump size the same as the diaphragm diameter?
No. The 2″ size describes the nominal suction and discharge connections on the pump. It is not the outside diameter of the diaphragm. The diaphragm is much wider than the pump port and has a formed center and mounting edge. Compare the outside diameter, center section, total height, edge shape, and mounting points with the old diaphragm before ordering a replacement.
How do I confirm that neoprene is the correct material?
Check the old diaphragm, pump service records, parts information, or the material selected for the pumped fluid. CH&E pump parts may be offered in several materials, including neoprene, rubber, TPE, Buna-N, and Viton. These materials are not automatically interchangeable for every application. Confirm the material that was previously installed and review the pumped fluid before changing to neoprene.
When should I inspect or replace the diaphragm?
Inspect the diaphragm when the pump has trouble priming, loses flow, or shows a visible crack, break, or leak. These signs do not prove that the diaphragm is the only damaged part. Leaking suction hoses, worn flap valves, loose connections, and damaged sealing surfaces may cause similar problems. Inspect the diaphragm and related pump parts together. Replace the diaphragm when damage or wear is confirmed.
What related parts should I inspect during diaphragm service?
Inspect the inlet and outlet flap valves, diaphragm bottom plate, water-box sealing surface, mounting hardware, connecting parts, hoses, and clamps. A worn flap valve or leaking hose may cause poor priming even after a new diaphragm is installed. Check each sealing surface for damage and remove dirt or old material before assembly. Replace only the parts that are worn, damaged, or no longer seal correctly.
What information should I send for fitment help?
Send the pump model, serial number, and a clear photo of the identification tag. Include photos of the front and back of the old diaphragm. Also provide any molded or printed number, the outside diameter, center measurements, overall height, mounting design, and required material. Ken’s Distributing can review these details and help you compare them with the available replacement diaphragm before you order.