Mud Hog Replacement Diaphragms for Diaphragm Pumps

How Mud Hog Diaphragm Pumps Work

Mud Hog diaphragm pumps use two flexible diaphragms operating through alternating strokes to move fluid through the pump. As one diaphragm moves through its suction stroke, the other moves through its discharge stroke, helping maintain consistent fluid movement through the pump body.

The diaphragms separate the fluid side of the pump from the internal drive components. This design allows Mud Hog pumps to handle water containing mud, sediment, slurry, and suspended solids without relying on a conventional impeller.

Because the diaphragms repeatedly flex during operation, both diaphragm material and physical condition affect pump performance. The replacement material should be selected according to the Mud Hog model, fluid being pumped, operating environment, and expected duty cycle.

Mud Hog pumps in the 200, 300, and 400 Series use two diaphragms. When diaphragm service is required, inspect both diaphragms and follow the Mud Hog service procedure for your specific model.

Common Applications for Mud Hog Diaphragm Pumps

Mud Hog pumps are used in construction, municipal, agricultural, industrial, and emergency applications where the pump may encounter sediment, solids, slurry, or demanding operating conditions.

Construction dewatering: Removing groundwater, standing water, sediment-laden water, and slurry from excavations, trenches, foundations, and active construction sites.

Municipal utility work: Supporting water removal, stormwater control, sewer maintenance, and infrastructure projects where the fluid may contain sediment or debris.

Agricultural water transfer: Moving pond water, irrigation water, drainage water, and other water-based fluids in agricultural operations.

Industrial wastewater and slurry transfer: Handling process water, slurry, wash water, and selected industrial fluids according to the diaphragm material and operating conditions.

Flood and emergency water removal: Supporting high-volume pumping during flood response, storm cleanup, and temporary emergency dewatering.

Concrete cutting, grinding, and grooving: Moving cooling water and slurry generated during concrete cutting, surface grinding, and related construction operations.

Mud Hog 200 Series, 2 Inch Replacement Diaphragms

Mud Hog 200 Series Pump Models

Common Mud Hog 200 Series models include:

• Mud Hog 201
• Mud Hog 202
• Mud Hog 202D
• Mud Hog 203
• Mud Hog 204

These are 2 inch Mud Hog diaphragm pump applications. Each pump uses two diaphragms for a complete diaphragm service.

Always confirm the complete Mud Hog model number before ordering. Ken’s Distributing can identify the appropriate replacement diaphragm using the model, existing diaphragm information, material requirements, and application details.

Mud Hog 200 Series Diaphragm Materials

Rubber: A cost-effective option for clean water, groundwater, and lightly sediment-laden water where petroleum and aggressive chemical exposure are minimal.

Neoprene: Commonly selected for construction dewatering, slurry, dirty water, concrete cutting wastewater, and outdoor applications where physical durability and weather resistance are important.

Buna/Nitrile: Commonly used when the pumped fluid contains oil, fuel, lubricants, petroleum residue, or other hydrocarbon contamination.

TPE: A durable option for selected continuous-duty, high-cycle, outdoor, and demanding applications where fatigue resistance and longer service intervals are priorities.

Specialty materials: Selected Mud Hog applications may require specialty diaphragm compounds because of unusual chemicals, elevated temperatures, or other demanding operating conditions. Contact Ken’s Distributing before specifying a specialty material.

Common Applications for Mud Hog 200 Series Pumps

• Construction site drainage
• Trench and excavation dewatering
• Groundwater removal
• Agricultural water transfer
• Municipal utility maintenance
• General water transfer

Mud Hog 300 Series, 3 Inch Replacement Diaphragms

Mud Hog 300 Series Pump Models

Common Mud Hog 300 Series models include:

• Mud Hog 302
• Mud Hog 302B
• Mud Hog 302C
• Mud Hog 304
• Mud Hog 305

These are 3 inch Mud Hog diaphragm pump applications. Each pump uses two diaphragms for a complete diaphragm service.

Confirm the complete Mud Hog model number and diaphragm requirements before ordering. If the pump identification plate is missing or unreadable, photographs of the pump and existing diaphragms may help Ken’s Distributing identify the appropriate replacement.

Mud Hog 300 Series Diaphragm Materials

Rubber: A practical option for clean water, groundwater, and lightly sediment-laden water in standard dewatering applications.

Neoprene: Commonly selected for construction dewatering, concrete cutting slurry, sediment-laden groundwater, wastewater, and outdoor applications.

Buna/Nitrile: Designed for applications involving oily water, fuel-contaminated groundwater, petroleum products, lubricants, and related hydrocarbon-containing fluids.

TPE: A durable material option for selected high-cycle, continuous-duty, abrasive, and demanding Mud Hog applications.

Reinforced material options: Selected applications may benefit from diaphragms designed for additional dimensional stability or resistance to physical stress. Availability depends on the Mud Hog model and required material.

Common Applications for Mud Hog 300 Series Pumps

• Construction site dewatering
• Municipal water-removal operations
• Utility maintenance
• Agricultural pond and lagoon pumping
• Industrial wastewater and slurry transfer
• Concrete cutting and grinding slurry management

Mud Hog 400 Series, 4 Inch Replacement Diaphragms

Mud Hog 400 Series Pump Models

Common Mud Hog 400 Series models include:

• Mud Hog 403
• Mud Hog 404
• Mud Hog 405
• Mud Hog 414
• Mud Hog 419
• Mud Hog 445
• Mud Hog 446

These are 4 inch Mud Hog diaphragm pump applications. Each pump uses two diaphragms for a complete diaphragm service.

Ken’s Distributing supplies replacement diaphragm options for Mud Hog 400 Series pumps in several materials. Contact Ken’s Distributing with the complete Mud Hog model number to confirm the appropriate diaphragm, material, and current availability.

Call (303) 699-7845 or contact Ken’s Distributing online for assistance with Mud Hog 400 Series replacement diaphragms and repair parts.

Common Applications for Mud Hog 400 Series Pumps

• Large-volume construction dewatering
• Flood and emergency water removal
• Municipal infrastructure projects
• Sewer and utility pumping
• Industrial slurry transfer
• Mining and aggregate water handling

How to Choose a Mud Hog Diaphragm Material

The correct diaphragm material depends primarily on the fluid being pumped and the operating conditions of the Mud Hog pump.

Clean water and standard groundwater: Rubber or neoprene may be appropriate depending on outdoor exposure, operating hours, and service requirements.

Construction slurry and sediment-laden water: Neoprene is commonly selected where abrasion, flexing, and outdoor durability are important.

Concrete cutting and grinding wastewater: Neoprene is commonly used for water-based construction slurry containing suspended fine particles.

Oily wastewater and petroleum-contaminated fluids: Buna/nitrile is commonly selected where greater resistance to oils, fuels, and hydrocarbons is required.

Continuous-duty and high-cycle operation: TPE may be appropriate for selected demanding applications where fatigue resistance and longer service intervals are priorities.

Specialty fluid applications: Some chemical or temperature conditions may require a specialty diaphragm material. The fluid, concentration, temperature, and pump model should be reviewed before ordering.

If your application falls outside normal water, dewatering, slurry, or petroleum-contaminated fluid conditions, contact Ken’s Distributing with your Mud Hog model number and application details.

How to Identify the Correct Mud Hog Replacement Diaphragm

Use the complete Mud Hog pump model rather than nominal size alone when ordering replacement diaphragms.

Useful identification information includes:

• Mud Hog pump model number
• Mud Hog pump series
• Nominal pump size
• Existing diaphragm material
• Existing part information, if available
• Physical diaphragm measurements
• Fluid being pumped
• Operating environment and duty cycle

If the pump model cannot be identified from the nameplate, provide photographs of the pump, diaphragm housing, existing diaphragms, drive arrangement, and any visible casting or identification numbers.

Ken’s Distributing can use this information to help identify the appropriate replacement diaphragms for your specific Mud Hog pump.

Signs Your Mud Hog Diaphragms May Need Replacement

Diaphragm wear may appear as gradual performance loss before a complete failure occurs. Because Mud Hog pumps use two diaphragms, both should be inspected when pump performance changes unexpectedly.

Inspect the diaphragms if you notice any of the following:

• The pump takes longer than normal to prime
• Discharge flow decreases under otherwise normal operating conditions
• Pump cycling becomes irregular or labored
• Air appears in the discharge stream
• Visible cracking, cuts, surface stiffening, fabric exposure, or deformation
• Fluid appears where it should not be within the pump assembly
• Pump vibration or operating noise changes noticeably

When diaphragm service is required, inspect both diaphragms and related wear components. Follow the Mud Hog service procedure for the specific model when determining which components should be replaced together.

Mud Hog Diaphragm Installation and Maintenance

Installation

Confirm the Mud Hog model, diaphragm specifications, and selected material before beginning installation. A complete diaphragm service on the Mud Hog models covered here requires two diaphragms.

• Clean both diaphragm housings and mounting surfaces before installing replacement components.
• Confirm each replacement diaphragm against the original part for the specific Mud Hog model.
• Install matching diaphragms according to the Mud Hog service procedure.
• Tighten cover hardware evenly using the recommended sequence and torque specifications for the pump.
• Inspect flappers, valve assemblies, seats, plates, and related wear components while the pump is disassembled.

Maintenance

• Inspect both diaphragms regularly according to operating hours and application conditions.
• Increase inspection frequency for pumps handling abrasive slurry or operating continuously.
• Flush the pump after handling sediment, slurry, oily water, or chemically active fluids.
• Inspect flappers and valves whenever diaphragm service is performed.
• Follow Mud Hog storage recommendations during extended periods of inactivity.

Why Both Mud Hog Diaphragms Should Be Serviced Together

The Mud Hog models covered on this page use two diaphragms as part of the pumping system. Both diaphragms experience repeated flexing and pressure cycles during operation.

When one diaphragm shows significant wear, inspect the second diaphragm as part of the same service. Installing matched replacement components helps maintain consistent operation between the two pumping chambers.

Ken’s Distributing can provide the quantity and replacement information required for your specific Mud Hog model.

Bulk Pricing and Blanket Orders for Mud Hog Diaphragms

Contractors, rental companies, municipalities, distributors, and industrial operations maintaining multiple Mud Hog pumps can reduce downtime by keeping replacement diaphragms in inventory.

Ken’s Distributing offers bulk pricing on qualifying Mud Hog diaphragm orders, including orders of 15 units or more. Blanket order programs are also available for organizations with recurring replacement-part requirements.

Because the Mud Hog models covered on this page use two diaphragms per pump, organizations maintaining multiple units may benefit from planning replacement inventory in matched quantities.

Contact Ken’s Distributing with your Mud Hog model, pump series, diaphragm material requirements, and estimated annual quantity for pricing information.

Learn More About Blanket Orders

Related Mud Hog Pump Repair Parts

Diaphragms are not the only wear components that should be inspected during Mud Hog pump service. Depending on the pump model and operating hours, related maintenance items may include flappers, valve assemblies, seats, plates, seals, fasteners, and other repair components.

Flappers and Valve Assemblies

Flappers and valve components help control fluid movement through the pump. Worn, damaged, or debris-fouled components can reduce flow, make priming more difficult, and contribute to irregular pump performance.

Inspect these components whenever diaphragm service is performed.

Mud Hog Repair Kits

Ken’s Distributing supplies repair parts and selected repair kits for Mud Hog 200, 300, and 400 Series pumps. Kit contents and availability depend on the specific Mud Hog model.

Contact Ken’s Distributing with your complete pump model number for current repair kit and component information.

Browse Other Diaphragm Pump Manufacturer Categories

If you are servicing a diaphragm pump from another manufacturer, use the appropriate manufacturer-specific category below. Replacement parts should be selected according to the manufacturer and model of the pump being serviced.

• CH&E Replacement Diaphragms
• Magnum Replacement Diaphragms
• AMT Replacement Diaphragms
• Wacker Replacement Diaphragms
• Gorman-Rupp Replacement Diaphragms
• Multiquip Replacement Diaphragms
• Riverside Replacement Diaphragms
• Tsurumi Replacement Diaphragms

Shop Replacement Diaphragms by Material

• Rubber Replacement Diaphragms
• Neoprene Replacement Diaphragms
• Buna/Nitrile Replacement Diaphragms
• TPE Santoprene Replacement Diaphragms

Frequently Asked Questions About Mud Hog Replacement Diaphragms

How many diaphragms does a Mud Hog pump use?

The Mud Hog 200, 300, and 400 Series models covered on this page use two diaphragms. When diaphragm service is required, inspect both diaphragms and follow the Mud Hog maintenance procedure for the specific pump model.

How do I identify the correct Mud Hog diaphragm?

Start with the complete Mud Hog model number and pump series. Also provide the existing diaphragm information, material, pump size, and application details when available. Ken’s Distributing can use this information to identify the appropriate replacement for the specific Mud Hog pump.

Which Mud Hog diaphragm material is commonly used for concrete cutting slurry?

Neoprene is commonly selected for Mud Hog pumps handling water-based concrete cutting and grinding slurry because it provides useful resistance to physical wear, outdoor exposure, and repeated flexing. The exact diaphragm material should still be selected according to the Mud Hog model and operating conditions.

Are specialty diaphragm materials available for Mud Hog pumps?

Selected Mud Hog applications may have specialty material options for demanding chemical, temperature, or physical conditions. Availability depends on the pump model and application. Contact Ken’s Distributing with the fluid details and Mud Hog model before ordering a specialty diaphragm material.

What is a reinforced diaphragm?

Some diaphragm designs incorporate reinforcement to provide additional dimensional stability or resistance to physical stress during repeated pump cycling. Availability and recommended use depend on the Mud Hog model and application.

Can I install two different diaphragm materials in the same Mud Hog pump?

Use matched replacement diaphragms specified for the Mud Hog model being serviced. Do not mix diaphragm materials or replacement specifications unless the pump manufacturer specifically calls for that arrangement.

Do you carry Mud Hog diaphragms for the 200, 300, and 400 Series?

Yes. Ken’s Distributing supplies replacement diaphragm options for Mud Hog 200 Series, 300 Series, and 400 Series pumps. Contact Ken’s Distributing with the complete Mud Hog model number to confirm the appropriate replacement and current availability.

How do I identify a Mud Hog diaphragm if the pump tag is unreadable?

Provide photographs of the pump, diaphragm housing, existing diaphragms, drive arrangement, and any visible casting or identification numbers. Physical diaphragm measurements may also help the parts team identify the appropriate replacement.

Is bulk pricing available for Mud Hog replacement diaphragms?

Yes. Ken’s Distributing offers bulk pricing on qualifying orders, including orders of 15 units or more, as well as blanket order programs for contractors, rental operations, municipalities, distributors, and businesses maintaining multiple Mud Hog pumps.

Do you ship Mud Hog replacement diaphragms to Canada?

Yes. Ken’s Distributing ships Mud Hog replacement diaphragms throughout the United States and Canada. Contact Ken’s Distributing for shipping information on larger, bulk, or recurring orders.