Iwaki MD-55RLT-115 Magnetic Drive Centrifugal Pump
The Iwaki MD-55RLT-115 is a compact, sealless magnetic drive pump built for anyone who needs dependable fluid movement without the noise, leaks, or maintenance headaches of a traditional shaft-seal pump. Its glass-fiber reinforced polypropylene housing shrugs off corrosive liquids, while the magnetically coupled rotor eliminates the mechanical seal entirely, so there's nothing to wear out or drip over time. Paired with a 1/8 HP, 115-volt TEFC motor spinning at 3400 RPM, it delivers steady flow through 1-inch NPT threaded ports while running remarkably quiet.
What sets this pump apart is its versatility. It's equally at home circulating water through a filtration system, transferring mild chemicals in a lab or industrial process, or feeding a pressure-rated canister filter that needs to push against back pressure. The internal cooling circuit continuously bathes the bearings in the pumped fluid, which keeps operating temperatures low and extends service life even during long, continuous runs. An alumina ceramic spindle and PTFE bearing add further durability for demanding, everyday use.
Owners consistently point to two things: how quiet it runs and how long it lasts when properly maintained. Because it's not self-priming, it's best suited for flooded suction or gravity-fed setups, and it should never be run dry. For anyone comparing mag-drive pumps for general fluid transfer, water circulation, or process applications, the MD-55RLT-115 offers a proven balance of reliability, low noise, and corrosion resistance in a compact footprint.
Key Features
- Magnetically coupled, sealless design eliminates leaks and shaft-seal wear
- Glass-fiber reinforced polypropylene (GFRPP) casing resists corrosion
- Internal cooling circuit reduces bearing temperature during operation
- PTFE bearing with alumina ceramic thrust ring and spindle for durability
- Quiet, low-vibration operation suitable for noise-sensitive environments
- TEFC (Totally Enclosed Fan Cooled) motor for added protection
Applications
- General fluid transfer and process circulation
- Chemical transfer in light industrial and laboratory settings
- Water circulation and filtration systems
- Pressure-rated feed to canister filters or systems with back pressure
- Cooling loops for equipment such as chillers and lasers
- Recirculation in analytical or instrumentation equipment
Specifications
- Port Size: 1" NPT threaded (inlet and outlet)
- Motor Output: 1/8 HP
- Voltage: 115V AC, single phase
- Frequency: 50/60 Hz
- Motor Speed: 3400 RPM
- Max Amps: 1.6
- Max Flow: Up to 16 GPM (approx. 1,104 GPH)
- Max Head: 26.9 ft
- Specific Gravity Limit: 1.2 S.G.
- Construction: GFRPP (glass-fiber reinforced polypropylene)
- Bearing: PTFE with alumina ceramic spindle
- Motor Enclosure: TEFC
Frequently Asked Questions
Q: Is the Iwaki MD-55RLT-115 self-priming?
A: No, this pump is not self-priming. It requires a flooded suction or gravity-fed supply line to operate properly and should never be run dry.
Q: What liquids can be pumped with the MD-55RLT-115?
A: It's designed for water and mildly corrosive fluids compatible with polypropylene, PTFE, and ceramic components. Because it uses magnetic coupling, avoid liquids containing iron, nickel, or other magnetic particulates.
Q: What is the specific gravity limit for this pump?
A: The MD-55RLT-115 is rated for fluids with a specific gravity up to 1.2.
Q: Does the pump include a power cord and plug?
A: It typically ships with a power cord, but the plug may not be pre-installed and must be wired on separately, depending on the supplier.
Q: How long can I expect this pump to last?
A: With proper priming, clean fluid, and regular inspection of the impeller and bearings, many users report several years of reliable service, though bearing wear over time is a normal maintenance consideration.
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