CH&E Replacement Diaphragms for Diaphragm Pumps

CH&E replacement diaphragms for diaphragm pumps are available through Ken’s Distributing in rubber, neoprene, Buna/nitrile, and TPE/Santoprene compounds, sized to fit the 2 inch and 3 inch CH&E pump models most commonly used in construction dewatering, trench work, grinding and grooving operations, municipal water removal, and industrial fluid transfer. Ken’s Distributing is an authorized CH&E dealer, which means our parts team works directly with CH&E to confirm fit, material specifications, and availability for both current and legacy pump models.

If your CH&E pump is losing prime, dropping flow, or showing signs of diaphragm wear, the sections below will help you identify the correct replacement diaphragm and get it shipped quickly.

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Available materials

Neoprene

Rubber

TPE

Neoprene

2″ CH&E Replacement Diaphragm – Neoprene

3″ CH&E Replacement Diaphragm – Neoprene

Rubber

2″ CH&E Replacement Diaphragm – Rubber

3″ CH&E Replacement Diaphragm – Rubber

TPE

2″ CH&E Replacement Diaphragm – TPE

3″ CH&E Replacement Diaphragm – TPE

CH&E Diaphragm Pump Background

CH&E diaphragm pumps are built specifically for the kind of water that centrifugal and submersible pumps struggle with: heavy solids-laden slurry, trash water, mud, sludge, and sediment-laden groundwater that would clog or damage a standard pump in short order. The diaphragm is the component doing the actual work in these pumps, flexing thousands of times per shift while passing material that would stop a standard pump immediately.

Because the diaphragm is the primary wear component in a CH&E pump, selecting the right replacement material for your specific application is the most important decision in the parts selection process. The wrong material will wear out faster, cost more over time, and in some cases fail prematurely in ways that damage other pump components.

Ken’s Distributing has supported CH&E pump owners since 1991 and carries diaphragms for current production models as well as legacy CH&E pumps still in active field service.

Available Sizes

Ken’s Distributing stocks CH&E replacement diaphragms in the two sizes that cover the majority of CH&E pump models in active use. Custom sizes for older or specialty CH&E pumps can be sourced on request.

2 Inch CH&E Replacement Diaphragms

Standard 2 inch replacement diaphragms for CH&E pumps used in trench dewatering, light slurry transfer, and general construction site work. Available in rubber, neoprene, Buna/nitrile, and TPE/Santoprene.

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3 Inch CH&E Replacement Diaphragms

Larger 3 inch replacement diaphragms for CH&E pumps moving higher volumes, heavier solids loads, and full-day continuous jobsite operation. Available in rubber, neoprene, Buna/nitrile, and TPE/Santoprene.

Shop 3 Inch CH&E Diaphragms

Non-Standard and Legacy Sizes

Older CH&E pumps and specialty configurations sometimes require a diaphragm size outside the standard 2 inch and 3 inch range. If your pump requires a non-standard size, contact Ken’s Distributing with your pump model number and existing diaphragm measurements and our parts team will confirm whether the correct diaphragm is available.

Call (303) 699-7845 or contact us online to confirm fit for your specific CH&E pump.

Available Diaphragm Materials

Every CH&E replacement diaphragm Ken’s Distributing stocks is available in four material compounds. The correct material depends on the fluid being pumped, the operating environment, and the daily run time of the pump. The descriptions below are specific to CH&E pump applications.

Neoprene CH&E Diaphragms

Neoprene is the most commonly specified diaphragm material for CH&E pumps in construction dewatering, groundwater control, and concrete cutting and grinding applications. It handles the combination of physical wear, vibration, and outdoor exposure that CH&E pumps experience in these environments better than natural rubber, at a cost that makes it practical for routine replacement.

Neoprene is the right choice for CH&E pumps handling:

Clean to moderately contaminated groundwater without significant hydrocarbon content
Construction slurry from wet concrete cutting, surface grinding, and joint sawing
Sediment-laden surface water and trench water in active construction environments
Outdoor pump operation with exposure to UV, ozone, and temperature variation

Neoprene is not the right choice when the water contains significant oil, fuel, or chemical content. Use Buna/nitrile or TPE/Santoprene for those conditions.

Temperature range: approximately -20C to 100C. Confirm for your specific application.

Rubber CH&E Diaphragms

General-purpose rubber diaphragms are the most cost-effective option for CH&E pumps handling clean water, standard groundwater, and lightly turbid water without chemical or hydrocarbon contamination. Rubber delivers excellent flex life in clean-water applications and is a practical choice for CH&E pump owners who need a reliable, economical diaphragm for standard dewatering work.

Rubber is the right choice for CH&E pumps handling:

Clean groundwater and surface water on construction sites
Standard dewatering where the water does not contain oil, fuel, or chemical contaminants
Pond pumping and general water transfer in clean-water environments
Intermittent-use applications where the pump does not run continuously for extended hours

Rubber is not recommended for outdoor pump storage environments with significant UV and ozone exposure over time. Neoprene or TPE/Santoprene will last longer in those conditions.

Buna/Nitrile CH&E Diaphragms

Buna-N nitrile is the correct diaphragm material when the fluid being pumped contains petroleum products, fuels, hydraulic fluid, or other hydrocarbons. CH&E pumps are used in demolition, industrial, and environmental remediation work where oily wastewater and fuel-contaminated groundwater are common. In those applications, rubber and neoprene will degrade rapidly, and Buna/nitrile is the appropriate specification.

Buna/nitrile is the right choice for CH&E pumps handling:

Oily wastewater and fuel-contaminated groundwater on industrial and demolition sites
Petroleum-containing slurry and wash water from equipment cleaning operations
Groundwater with hydrocarbon contamination in environmental remediation applications
Any fluid with a significant oil or fuel component that would cause rubber or neoprene to swell or degrade

Note: Buna/nitrile has limited weather and ozone resistance compared to neoprene. It is best suited for applications where the diaphragm is protected from prolonged UV and ozone exposure between pump uses.

Temperature range: approximately -40F to 250F for Buna/nitrile compounds. Confirm for your specific application.

TPE Santoprene CH&E Diaphragms

TPE Santoprene diaphragms are the longest-lasting option Ken’s Distributing carries for CH&E pumps, and they are the correct choice for CH&E applications involving continuous-duty operation, abrasive slurry, chemical exposure beyond what neoprene handles reliably, or situations where diaphragm failure and unplanned downtime carry a high operational cost.

Santoprene combines the flex fatigue resistance needed for high-cycle CH&E pump applications with broader chemical tolerance and better temperature range than rubber or neoprene. The higher per-unit cost compared to rubber and neoprene is typically justified in applications where those materials require more frequent replacement.

TPE Santoprene is the right choice for CH&E pumps handling:

Abrasive slurry in high-cycle, continuous-duty applications where rubber and neoprene wear out too quickly
Fluids with mild chemical content, dilute acids, alkalis, or cleaning agents where neoprene is marginally compatible
Applications where pump downtime is costly and the longest available diaphragm service life is the priority
Cold-climate operation where rubber diaphragms stiffen and lose sealing performance in low temperatures

Chemical compatibility for any specific fluid must be confirmed before specifying Santoprene. Ken’s Distributing can assist with compatibility confirmation.

How to Select the Right CH&E Diaphragm Material

If you are unsure which compound to specify for your CH&E pump, the following decision framework covers the most common CH&E pump applications.

Clean water, groundwater, standard dewatering: Rubber or neoprene. Choose neoprene if the pump is stored outdoors or runs in high-vibration environments. Choose rubber if cost is the primary consideration and the water is clean.

Concrete cutting slurry, surface grinding wastewater, construction sediment water: Neoprene. The combination of abrasive particle content and outdoor operating conditions favors neoprene over rubber.

Oily wastewater, fuel-contaminated groundwater, hydrocarbon-containing fluids: Buna/nitrile. Neither rubber nor neoprene is appropriate for oil and fuel contact.

Continuous-duty high-cycle operation, abrasive slurry, mild chemical exposure, cold-climate operation: TPE Santoprene.

For applications that do not fit neatly into these categories, contact Ken’s Distributing with your pump model and a description of the fluid being pumped and our parts team will recommend the correct compound.

Compatible CH&E Pump Configurations

As an authorized CH&E dealer, Ken’s Distributing stocks replacement diaphragms for the CH&E pump configurations most commonly used in North American construction and industrial markets. These include:

2 inch CH&E diaphragm pumps
3 inch CH&E diaphragm pumps
Trailer-mounted CH&E dewatering units
Engine-driven CH&E pump configurations
Legacy CH&E pumps in continued field service

If you cannot identify your exact CH&E pump model, contact Ken’s Distributing with a photo of the pump tag and our parts team will confirm the correct diaphragm size and material for your unit.

Note on the relationship between this page and the CH&E and Magnum diaphragm page: Ken’s Distributing also carries replacement diaphragms for Generac Magnum pumps, which share some design characteristics with CH&E pumps. If your pump is a Magnum unit rather than a CH&E unit, see the CH&E and Magnum Replacement Diaphragms page for Magnum-specific compatibility information.

How to Identify a Worn CH&E Diaphragm

CH&E diaphragm wear is rarely sudden. Most diaphragm failures begin as gradual performance degradation that accelerates as the diaphragm continues to flex in a compromised state. Catching wear early protects the valves, seats, and connecting rod from secondary damage that is significantly more expensive to repair than the diaphragm itself.

Watch for these signs that your CH&E diaphragm needs replacement.

The pump takes noticeably longer to prime than it did when the diaphragm was new
Discharge flow drops at full throttle without a change in suction conditions or discharge head
Air bubbles appear in the discharge stream, indicating the diaphragm is allowing air to bypass
Visible cracks, splits, surface thinning, or permanent deformation on the diaphragm face or edges
Water seeping from around the diaphragm cover plate
The pump vibrates more than normal during operation, which can indicate uneven diaphragm flex

Replace the diaphragm at the first sign of wear rather than waiting for a complete failure. A torn diaphragm allows water and debris to enter the air chamber and connecting rod area, which can cause damage that requires a full pump rebuild rather than a simple diaphragm swap.

CH&E Diaphragm Installation and Maintenance

Correct installation and basic maintenance practices extend CH&E diaphragm service life and protect the other components in the pump from premature wear.

Installation:

Torque cover plate bolts evenly in a cross or star pattern to ensure uniform sealing pressure across the diaphragm face. Uneven torque causes edge leaks and accelerates localized wear.
Confirm the bolt pattern and center hole dimensions of the replacement diaphragm match the original before installation. On legacy CH&E pumps, bolt patterns can vary between production runs.
Inspect valve balls and seats at the same time as the diaphragm replacement. Worn valves reduce pump efficiency and can mask diaphragm performance improvements after a replacement.

Maintenance:

Inspect CH&E diaphragms every 500 to 1,000 operating hours in active construction use. Pumps handling abrasive slurry or running continuously should be inspected more frequently.
Replace both diaphragms at the same time on pumps that use two. Running one new diaphragm alongside a worn one creates pressure imbalance and accelerates wear on the new part.
Flush the pump after handling muddy, chemically contaminated, or fuel-containing water. Allowing these materials to dry inside the pump housing accelerates wear on diaphragms, valves, and seats.
Store the pump out of direct sunlight when not in use to slow UV and ozone degradation on rubber and neoprene diaphragms.

Blanket Orders and Bulk Pricing for CH&E Diaphragms

Contractors, rental companies, and municipal operations running multiple CH&E pumps benefit from maintaining a diaphragm inventory on hand before a failure occurs. Ken’s Distributing offers blanket order programs and bulk pricing tiers for organizations that need a reliable, year-round supply of CH&E replacement diaphragms.

Blanket orders allow you to lock in pricing, guarantee parts availability, and schedule fulfillment around your operational calendar rather than reacting to an unplanned pump failure in the field.

Learn More About Blanket Orders

For bulk order pricing on CH&E diaphragms in any material or size, contact Ken’s Distributing with your pump model, diaphragm size, material preference, and estimated annual volume.

Frequently Asked Questions About CH&E Replacement Diaphragms

Is Ken's Distributing an authorized CH&E dealer?

Yes. Ken’s Distributing is an authorized CH&E dealer. This means our parts team works directly with CH&E and can confirm fit, material compatibility, and availability for both current production models and legacy CH&E pumps still in field service.

How do I know which CH&E diaphragm size I need?

The two most common CH&E diaphragm sizes are 2 inch and 3 inch, which correspond to the pump’s discharge port diameter. However, the diaphragm dimensions are not always directly derived from the port size alone. The safest way to confirm your size is to measure your existing diaphragm using the A, B, C method described on the main Replacement Diaphragms page, or contact Ken’s Distributing with your CH&E pump model number for a direct part confirmation.

Which diaphragm material is most commonly used in CH&E construction pumps?

Neoprene is the most commonly specified material for CH&E pumps in construction dewatering and concrete cutting applications because of its balance of outdoor durability, flex life, and cost. TPE Santoprene is specified when the pump operates continuously or handles fluids that shorten neoprene service life. Buna/nitrile is used when the fluid contains petroleum or hydrocarbon content.

Can I use a different material than what my CH&E pump originally came with?

In most cases, yes. Rubber, neoprene, Buna/nitrile, and TPE Santoprene diaphragms are often available in the same physical dimensions, allowing an operator to change materials without modifying the pump. Always confirm that the replacement diaphragm matches the physical dimensions of the original before ordering. Ken’s Distributing can confirm material availability in the correct dimensions for your CH&E pump model.

How long do CH&E diaphragms last?

Service life depends on the diaphragm material, the fluid being pumped, daily operating hours, and whether the pump is ever run dry. There is no single correct answer that applies to all CH&E pump applications. Inspect your diaphragm regularly and replace it at the first sign of performance degradation or visible wear rather than operating on a fixed time interval alone.

What happens if I run a CH&E pump with a worn or failed diaphragm?

Continuing to operate a CH&E pump with a torn or failed diaphragm allows water and debris to enter the air chamber and reach the connecting rod assembly. This can cause damage to components that are significantly more expensive than the diaphragm itself, potentially requiring a full pump rebuild. Replace the diaphragm at the first sign of wear.

Do you ship CH&E replacement diaphragms to Canada?

Yes. Ken’s Distributing ships CH&E replacement diaphragms to all 50 U.S. states and Canada. Contact us for shipping details on bulk or blanket orders.