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AMT Diaphragm Pump Replacement Parts

OEM-Fit Replacement Diaphragms & Check Valve Assemblies

Ken’s Distributing Company supplies OEM-fit AMT replacement diaphragms and check valve assemblies for diaphragm-type trash and dewatering pumps.

Each diaphragm controls the suction and discharge motion inside the pump, separating the air and liquid chambers for smooth, reliable operation. All AMT pumps in this category are single-diaphragm aluminum designs featuring an oil-bath gearbox, needle plunger bearing, and neoprene check valve assembly.

We stock replacement diaphragms in Rubber, Neoprene, Buna-N, and Thermoplastic Elastomer (TPE) — four proven materials that cover nearly every pumping condition from clean water to abrasive slurry and hydrocarbon exposure. Bulk orders of 15 units or more qualify for discount pricing for contractors, distributors, and small businesses nationwide.

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2-Inch AMT Replacement Diaphragms

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3-Inch AMT Replacement Diaphragms

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How AMT Diaphragm Pumps Work

  • Single diaphragm creates suction and discharge stroke inside the pump body.
  • Diaphragm separates air and liquid chambers to protect internal components.
  • Oil-bath gearbox and needle plunger bearing drive the diaphragm for smooth motion.
  • Neoprene check valve assembly controls one-way flow through the pump.

Why Choose AMT Replacement Diaphragms from Ken’s

  • OEM-fit parts matched to AMT 2" and 3" diaphragm pump models.
  • Rubber, Neoprene, Buna-N, and TPE compounds for every jobsite condition.
  • Bulk pricing for 15+ units for contractors and distributors.
  • Nationwide shipping and fast turnaround on stocked items.
  • Technical support for diaphragm and material selection.

2-Inch Series

2-Inch AMT Replacement Diaphragms

Fits AMT 2″ diaphragm pump models:

338Z-96 (Hatz 1B30 Diesel)

338G-96 (Honda GX120)

338L-96 (LCT 280CC) 338E-96 (1.5 HP 115 VAC @ 60 Hz)

338T-96 (1.5 HP 3-Phase 208–230/460 VAC @ 60 Hz).

Each pump uses one diaphragm. Connection: 2″ NPT.

Diaphragm Part Number

Replacement diaphragm part number

3380-300-00

Available Compounds (2" × 2")

Compound Best Application
Rubber General-purpose diaphragm for clear water or light sediment.
Neoprene Chemical- and abrasion-resistant for dirty water and slurry.
Buna-N Excellent resistance to oil, fuel, and hydrocarbon-contaminated liquids.
TPE (Thermoplastic) Long-life diaphragm with high flexibility and broad temperature tolerance.

Check Valve Assembly

#3360-070-90 (Neoprene)

Used For

small construction dewatering, trench and pit pumping, irrigation systems, and light industrial service.

3-Inch Series

3-Inch AMT Replacement Diaphragms

Fits AMT 3″ diaphragm pump models

337G-96 (Honda GX120)

337H-96 (Honda GX160)

337L-96 (LCT 280CC), 337Z-96 (Hatz 1B30 Diesel)

337E-96 (1.5 HP 115 VAC @ 60 Hz)

337T-96 (1.5 HP 3-Phase 208–230/460 VAC @ 60 Hz).

Each pump uses one diaphragm. Connection: 3″ NPT

Diaphragm Part Number

Replacement diaphragm part number

3370-300-00

Available Compounds (3" × 3")

Compound Best Application
Rubber Standard choice for clean or sediment-filled water.
Neoprene Tough, flexible, and resistant to abrasion in construction or wastewater.
Buna-N Oil- and fuel-resistant for hydrocarbon-exposed sites.
TPE (Thermoplastic) Premium compound for extended life under abrasive and chemical exposure.

Check Valve Assembly

#3354-070-90 (Neoprene)

Used For

large-volume construction dewatering, municipal bypass and storm-water control, industrial slurry and wastewater transfer.

Replacement & Maintenance Tips

  • Inspect diaphragms regularly for cracking, stiffening, or fabric exposure.
  • Replace the diaphragm if the pump loses suction, prime, or discharge flow.
  • Match diaphragm material to the liquid: clean water, slurry, oil, or chemicals.
  • Inspect and replace check valve assemblies when flow becomes erratic.
  • Follow AMT torque and assembly guidelines for proper sealing and service life.

Why Order AMT Diaphragms from Ken’s Distributing Company?

  • OEM-quality diaphragms for all AMT 2″ and 3″ pumps
  • Available in Rubber, Neoprene, Buna-N, and TPE materials
  • Bulk discounts starting at 15 units or more
  • Nationwide shipping with fast turnaround
  • Serving contractors, distributors, and small businesses across the U.S. and Canada
  • Expert support for material selection and pump compatibility

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