Iwaki L-MD-30RZ Magnetic Drive Liquid End
The Iwaki L-MD-30RZ is a complete liquid end assembly built for the MD and WMD-30 series magnetic drive pumps, giving owners a straightforward way to restore a worn or damaged wet end without replacing the entire pump. Because the magnetic coupling design keeps the motor and fluid path completely separate, there's no mechanical shaft seal to wear out over time — instead, this kit lets you refresh the parts that actually touch the fluid, namely the front casing, rear casing, impeller, and O-ring, so the pump runs like new again.
This particular liquid end is the high-head "RZ" variant, meaning it's engineered for applications where higher discharge pressure matters more than raw flow volume. It's molded from glass-fiber-reinforced polypropylene, a material chosen for its chemical resistance and durability, making it a practical choice well beyond typical marine or boat-fluid-transfer setups. Iwaki mag-drive pumps of this size show up in laboratory equipment, medical analyzers, plating and surface-treatment lines, constant-temperature baths, and general industrial chemical feed systems, so this liquid end is just as at home in a lab or manufacturing plant as it is on a boat.
Swapping in a new liquid end is one of the most cost-effective ways to extend the service life of an MD-30RZ or WMD-30RZ pump. Rather than sourcing a full replacement unit, technicians and maintenance teams can rebuild the wet end in place, cutting downtime and keeping the original motor in service.
Key Features
- Complete liquid end assembly: front casing, rear casing, impeller, and O-ring included
- Compatible with both MD and WMD pump series
- High-head (RZ) design for elevated discharge pressure applications
- GFRPP (glass-fiber-reinforced polypropylene) construction for broad chemical resistance
- Magnetic drive design eliminates mechanical shaft seals for leak-free operation
- Simple bolt-on replacement for existing MD/WMD-30 series pumps
Applications
- Chemical feed and dosing systems
- Laboratory and analytical equipment
- Medical and blood analyzer instrumentation
- Constant-temperature bath circulation
- Surface treatment and plating lines
- General industrial fluid transfer
- Marine and boating fluid transfer systems
Specifications
- Part Number: L-MD-30RZ
- Pump Series Compatibility: MD-30RZ, WMD-30RZ
- Material: GFRPP (glass-fiber-reinforced polypropylene)
- Type: High-head liquid end
- Components Included: Front casing (1), rear casing (1), impeller (1), O-ring (1)
- Port Size: 20mm / 3/4" hose barb connection (standard union)
- O-Ring Material: FKM standard (EPDM available on special order)
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Manufacturer: Iwaki
Frequently Asked Questions
Q: Can the L-MD-30RZ liquid end be installed without replacing the pump motor?
A: Yes. This kit only replaces the wet end components, so the existing motor and magnetic coupling stay in place, keeping the rebuild quick and affordable.
Q: Is this liquid end only suitable for marine applications?
A: No. While it works well for marine fluid transfer, it's equally common in laboratory instruments, chemical feed systems, plating lines, and temperature-controlled baths.
Q: What's the difference between the standard MD-30R liquid end and the L-MD-30RZ?
A: The "RZ" designation indicates the high-head variant, built to generate greater discharge pressure than the standard "R" type at a similar flow range.
Q: Does this liquid end come with mounting hardware or gaskets beyond the O-ring?
A: The kit includes the front casing, rear casing, impeller, and O-ring; no additional mounting hardware is included, so existing fasteners from the original pump are reused.
Q: What kind of fluids is the GFRPP material compatible with?
A: GFRPP offers broad resistance to many acids, alkalis, and chemical solutions, which is why it's a common choice for chemical feed and industrial fluid-handling applications, though compatibility should always be checked against the specific fluid in use.
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