AMT 338E-94 1.5 HP 2" Electric Self-Priming Diaphragm Pump
If you need a pump that can handle thick, messy liquids without choking on solids, the AMT 338E-94 earns its keep. This is a 1.5 HP electric diaphragm pump built around a 2" NPT suction and discharge, powered by a 115 VAC single-phase motor with manual reset overload protection. It's part of AMT's long-running 338 Series, which replaced the older 336 model line, and it carries forward the same reputation for being a workhorse in tough conditions.
What sets a diaphragm pump like this apart from a standard centrifugal unit is its ability to move liquids loaded with debris. The Santoprene diaphragm and 2-stage forged gear transmission let it pass solids up to 1-5/8" in diameter, which means it can handle mud, slurry, sewage, and other thick materials that would jam a typical pump. It self-primes to as much as 25 feet of lift after the initial prime, so it doesn't need to sit right at the water's edge to get to work. The sand cast aluminum body keeps the whole unit light enough to move around a job site while still standing up to daily abuse.
This pump shows up most often on construction sites, in municipal and utility work, at agricultural operations, and anywhere general industrial dewatering is needed — trench and excavation pump-out, tank draining, cleanup after flooding, and similar applications. It's not limited to marine or boating use; it's a general-purpose workhorse for any setting where liquids need to move fast without worrying about what's mixed in.
Key Features
- Sand cast aluminum construction for durability and portability
- Thermoplastic Santoprene diaphragm for chemical resistance and long service life
- 2-stage, heavy duty forged gear driven transmission
- Self-priming to 25 ft. lift after initial prime
- Handles solids up to 1-5/8" in diameter
- Modular component design for easy maintenance and cleanout
- 90° rotatable base for flexible setup
- Includes steel suction strainer, NPT nipples, and wheel kit for mobility
Applications
- Construction site dewatering and excavation pump-out
- Municipal and utility sludge or sewage handling
- Agricultural liquid transfer
- Flood cleanup and emergency water removal
- Industrial slurry and mud transfer
- General-purpose portable pumping (not limited to marine use)
Specifications
- Model: 338E-94
- Motor: 1.5 HP, 115 VAC single-phase electric, manual reset overload
- Port Size: 2" FNPT suction and discharge
- Diaphragm Material: Santoprene
- Priming Lift: Up to 25 ft. after initial prime
- Maximum Solids Handling: 1-5/8"
- Stroke Rate: 40 strokes per minute (electric motor models)
- Housing Material: Sand cast aluminum
- Mounting: 56C motor frame
Frequently Asked Questions
Q: Can the AMT 338E-94 run continuously for long dewatering jobs?
A: Yes, it's built for extended duty cycles on job sites, though like any pump it benefits from periodic checks of the diaphragm and strainer during long runs.
Q: Does this pump need to be primed manually before each use?
A: It requires an initial prime, but once primed, its built-in check valve allows it to self-prime again on subsequent starts, even after the suction line loses its liquid seal.
Q: What kind of power supply does the 338E-94 require?
A: It runs on a 115 VAC single-phase electrical connection, making it compatible with standard job site generators or power outlets.
Q: Is this pump suitable for pumping liquids with debris or small rocks?
A: Yes, its diaphragm design and wide passage tolerate solids up to 1-5/8" in diameter, which is why it's commonly chosen over standard centrifugal pumps for muddy or debris-laden liquids.
Q: How portable is the AMT 338E-94 on an active job site?
A: It ships with a wheel kit and its sand cast aluminum housing keeps overall weight manageable, so it can be rolled between locations without heavy equipment.
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