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Home » Saltwater Aquarium Supplies  » Water Pump  » External  » 1000 to 2000 GPH  »  Iwaki MD55RLT Water Pump (Japanese Motor)
Iwaki MD55RLT Water Pump (Japanese Motor)

Iwaki MD55RLT Water Pump (Japanese Motor)

Average Rating 4.5 70
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Iwaki MD55RLT Water Pump (Japanese Motor) Information

Product Manuals & Documentation

Magnetic water pumps. Magnetic driven. Sealess pumps for use on fresh or saltwater aquariums. Low heat exchange . Highly durable design. WMD pumps have American Made Motors. MD pumps have Japanese Made Motors. RLT pumps are for pressure applications. RLXT pumps are for circulation and wet/dry return.

Iwaki Walchem magnetic drive pumps will run longer, quieter and cooler than any traditional mag drive. Extraordinarily high efficiencies make WMD & MD the clear choice in almost every process, recirculation or transfer application.

Unique internal Cooling Circuit
Creates a positive, forced cooling path, lubricating bearing surfaces and actively purging gases & heat. Unique double bearing system allows cooling circuit liquid to continually "wash" front and rear radial bearings, extending bearing life.

Precision Tolerances
Pumps can be supplied with alumina ceramic or SiC spindles, bored, turned and highly polished. This precision machined spindle forms the center of the driven magnet. Substantially reduced hydraulic noise is a major feature of all WMD/MD impellers. Great pains are taken in the molding/finishing process to eliminate tangential misalignment.

Bearings/Thrust surfaces
High lubricity fluoropolymer bearings minimize mechanical losses typical of conventional mag drive pumps. High purity SiC radial bearings handle the most aggressive ultrapure chemistries. PTFE front thrust surface aids hydraulic balance and minimizes flashing. Large rear thrust surface guards against axial forces caused by cavitation or gas entrapment.

Drive magnet
Dynamically balanced barium ferrite drive magnets provide best magnet torque. Die cast magnet carrier creates a flywheel effect, which adds to the magnet safety factor.

Motor matching
Offering more standard motor/pump configurations than other manufacturers offer for tailored pump applications. Premium, high efficiency motors are used throughout the line. Totally enclosed, permanent split capacitor motors are compact, cool and economical. Tolerance to voltage variation without overheating and 50/60 Hz operation allow the product to be used in a worldwide market.

Model: MD55RLT*
Inlet(MPT)/Outlet(MPT): 1"/1"
Flow Rate @ 4` Head: 1080 GPH
Max Head ft: 26.9

In the unlikely event there are any problems with Iwaki water pumps or warranty work is needed at some point, please contact Iwaki directly at 508.429.1440 for an RGA. Do NOT send a pump back to Iwaki without an RGA number. Please contact us for any assistance you may need in this unlikely situation.

Note: Power outlet plug NOT included.

Model Hose NPTM Output
Max Flow
Max Head
Max Sys
S.G. Weight
MD55RLT 1" 1" 1/9 3400 1.6 18.4 26.9 17.1 1.2 10
MD70RLT 1" 1" 1/4 3400 2.8 25.6 31.8 21.3 1.0 13
MD100RLT 1" 1" 1/3 3400 3.4 35.6 39.0 25.6 1.2

Performance Curve

Note - IWAKI RLT are Pressure Rated pumps designed to pump into pressure canister filters or any situation that can create back pressure. IWAKI XT models are for standard circulation such as return from wet/dry. The pressure models are also suitable for standard return.

Manufacturer Info

Iwaki America Inc.
Iwaki America Inc. of Holliston, Massachusetts, is a joint venture which grew from a 15 year association between Walchem Corp. of Holliston, MA and Iwaki Co. Ltd. of Tokyo, Japan. Combining Walchem`s 30 years of chemical injection and control experience with Iwaki`s 50 years of pump design engineering, Iwaki America offers the best chemical handling equipment for use in Process, O.E.M., Industrial and Semiconductor applications. Iwaki America, along with Walchem Corporation and Terracon Corporation comprise the Walchem Group.

Iwaki MD55RLT Water Pump (Japanese Motor) Reviews

Average Rating
(70 reviews)
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of 7


Reviewers Rating Excellent!

Posted: 10/15/2015 from Anaheim, CA UNITED STATES
5.0 5
Experience Level: Intermediate

Comments: Very quiet love it

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Reviewers Rating Excellent!

Posted: 10/4/2015 from GRETNA, NE UNITED STATES
5.0 5
Experience Level: Intermediate

Comments: Money well spent. Extremely quiet and powerful. Lowered temperature in my tank drastically.

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Iwaki md-40 rlxt

Reviewers Rating Great

Posted: 8/31/2015 from Happy Valley, OR UNITED STATES
4.0 5
Experience Level: Intermediate

Comments: The pump is nice and powerful. However, it is louder than I expected to be. Good pump overall.

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Powerful and solid

Reviewers Rating Excellent!

Posted: 7/18/2015 from Clackamas, OR UNITED STATES
5.0 5
Experience Level: Intermediate

Comments: Very nice pump. It is powerful, and moves the water quickly. Its been running my tank since May now. I'm very happy with it, and the only complaint I have is that it seems to heat the water up. Not sure how that is happening, but I have never had to use a chiller until now. I'm hoping the chiller is not going to be a year round necessity. The pump seems quiet as the reviews say. I paid a premium to get this model, and it appears to be a good choice. The external mounting frees up so much more space inside the sump.

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love this pump

Reviewers Rating Excellent!

Posted: 2/12/2015 from Greensboro, NC UNITED STATES
4.5 5
Experience Level: Expert

Comments: replaced my gen-x pump with the md40 pump has slight hum, much quieter than previous pump. my md20 has been running for the past 12 years so if that is any indication of super pumps then no complaints.

1 of 1 People found this review helpful, did you? Yes No

Iwaki MD30

Reviewers Rating Excellent!

Posted: 2/28/2014 from WHARTON, NJ UNITED STATES
4.5 5
Experience Level: Intermediate

Comments: Great pump, incredibly quiet and plenty strong to run my ETSS Skimmer which was recommended to run with the MD40. Only draw back is it does get very hot, but I'll take the heat over noise any day. I also purchased the MDX40 which works great but because of the fan it is a little noisy!! All in all you can't beat these pumps, well worth the money!!

3 of 3 People found this review helpful, did you? Yes No


Reviewers Rating Excellent!

4.5 5
Experience Level: Intermediate

Comments: Excellent pump, runs great. Very quiet.

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canadians watch out!

Reviewers Rating Excellent!

Posted: 12/19/2013 from CALGARY, CANADA
5.0 5
Experience Level: Intermediate

Comments: Fantastic pump! if you are looking at it you already know. i live in canada and upon arrival ups hit me with a $72 import charge. not much value buying from the states after that imo. just a heads up to my canadian friends.

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Reviewers Rating Excellent!

Posted: 10/21/2013 from SAINT PAUL, MN UNITED STATES
5.0 5
Experience Level: Intermediate

Comments: There probably isn't a need to review Iwaki MD pumps. They've been around a long time and everyone knows they are well built. I have the 30RLT. The 20s and 30s don't have fans, so they run hot to the touch, but much quieter than the 40s and up. Pressure rated and likely to run unnoticed for years to come, it's a great pump. I also like knowing that replacement parts are easily found should I need them.

3 of 3 People found this review helpful, did you? Yes No

Good Strong Dependable Pump

Reviewers Rating Excellent!

Posted: 9/6/2013 from OR UNITED STATES
5.0 5
Experience Level: Intermediate

Comments: The Iwaki MD70 pump is a good quality and well designed pump, and circulates water quite well within the aquarium. It is however a bit on the loud side, so if you are looking for a quiet pump I would probably choose another. If you are wanting this pump to work with a large canister filter, it will certainly do the job with ease and can of course handle back pressure well. It has performed flawless for me thus far and I would certainly recommend this pump to anyone who wants quality & dependability!

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