MD-40RXT - 1344 GPH - Iwaki Japanese

Iwaki MD-40RXT
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  • Iwaki MD-40RXT
  • Iwaki MD-40RXT

MD-40RXT - 1344 GPH - Iwaki Japanese

100% Recommend this to a friend (8 of 8)

SKU: 300403

reg. $319.99

Special Price: $271.99

In Stock: 3
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Quick Overview

Why does BRS recommend this?

Anytime we need an external pump the Iwaki Japanese motors are our first choice.  There are cheaper options that work just fine, however when it comes to noise the Iwaki Japanese external pumps are class leaders and for any area where noise a concern and space is limited. The Japanese Iwaki pump is the way to go.

  • Japanese Motor

  • Max Flow: 1344 GPH

  • Max Head: 15.4 Ft

  • 1” Inlet(MPT)/1” Outlet(MPT)

  • Max Amps: 1.2

  • Motor Output: 1/12 HP

Note: The Iwaki MD pumps' power cords do not come with the plug pre-spliced.


Full Details

External pump from Iwaki, the world leader in small magnetically coupled centrifugal pump technology. Japanese-made motor is designed especially for aquatic applications. Super quiet and energy efficient with less parts.

High quality external pump with years of research and development behind its design. Iwaki pumps offer high pressure rates in a durable, compact pump. Easily tailor pump applications because of the numerous motor/pump configurations. MD stands for Mag-Drive.

MD Series – Japanese Motor

  • Japanese motor is made from cast aluminum with a cast end bell
  • Japanese model uses a custom pump design specifically for aquatic applications
  • Japanese pumps run cooler to the touch and slightly quieter, due to the thicker material

Quick Compare - Iwaki MD Pumps (Japanese Motors)


Power Usage

Maximum Flow

Maximum Head


Iwaki MD-20RT


492 GPH

14.1 ft

Hose 5/8” NPT ¾”

Iwaki MD-20RXT


822 GPH

8.2 ft

Hose 1” NPT 1”

Iwaki MD-30RT


600 GPH

17.7 ft

Hose ¾” NPT ¾”

Iwaki MD-30RXT


1140 GPH

13.5 ft

Hose 1” NPT 1”

Iwaki MD-40RT


822 GPH

21.3 ft

Hose ¾” NPT ¾”

Iwaki MD-40RXT


1344 GPH

15.4 ft

Hose 1” NPT 1”

Iwaki MD-55RLT


1104 GPH

26.9 ft

Hose 1” NPT 1”

Iwaki MD-70RLT


1536 GPH

31.8 ft

Hose 1” NPT 1”

Iwaki MD-100RLT


2136 GPH

39.0 ft

Hose 1” NPT 1”


8 Items

  • It's a great pump it works good on my 210gallon tank .I'm very happy with the pump. By Saul on 1/16/2017

    It's a great pump it works good on my 210gal tank .I'm very happy with the pump.
  • Iwaki MD-40RXT (Japanese Motor) 1344 GPH By dougL on 5/25/2015

    very happy with this pump purchase. using it for by 210. great output. very quiet compared to a Pan World 50PX-X that I had initially purchased from my LFS . spend the money and be happy.
  • My Iwakis ran for about 15 years By Gary on 10/12/2014

    I have two of these. One I bought 2 years ago and I just bought another one for a different application. Both pumps replaced older Iwaki American motor pumps that ran 13 and 15 years. I switched to Japanese because they are supposed to be even better. I can't remember when I had a different brand pump. As the website video says, the Japanese motors seem a little quieter than the American motors but both are of exceptional quality in my opinion. In the 15 years I had the American versions running (one for the skimmer, one for the return, I think I replaced an impeller once because it broke--something got into it; A different time I had a problem with calcium build up.(rookie move--Not properly maintaining Mg levels--I cleaned it and it was fine). I can't believe how long these pumps lasted. The one I just replaced was still working but was making noises and was very rusty--spilling/splashing salt water onto over the years and just being in the moist environment. I highly recommend these pumps. Gary.
  • Great pump, should have bought this in the first place! By Charles on 9/29/2013

    Replaced a loud power hungry pump with this one. Although this pump is rated at a lower flow than the old pump, the performance I'm seeing is equal or greater to the old pump. I replaced the old pump due to it's noise level. The pumps performance was constant, but the noise was getting worse and worse (loud humming that was there from the start). After installing the Iwaki, I'm seeing the power draw of the tank reduced by a 3rd even with the heater running more often, water temp is down by a degree, and now all I hear is the faint sound of the water moving through the system. If you can afford it, don't waste your money and your time, buy the Iwaki!
  • Good Pump By Warren on 4/23/2013

    Good pump but is a little loud. Was trying to find a quieter pump then my submergable, but this pump may even be louder. Going to try a little sound deading material. Even have the pump suspended in air so it's the pump and not the vibration.
  • Fantastic By Susan on 11/29/2012

    I really like this pump. I have never had an external pump before and I wasn't sure how loud it would be. I have been very happy with the performance and don't think it's too loud (my tank is in my dining room and the pump is not inside the stand).
  • Good pump By mgarc on 10/22/2012

    This pump is a real workhorse, never fails
  • Iwaki MD-40RXT 1200 GPH Pump By Doel on 9/14/2012

    Good pump it moves quite a bit of water in my 125. It's still runs loud, but all in all it's a good pump.


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