MD-20RXT - 822 GPH Japanese

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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.

  • Max Flow: 822 GPH
  • Max Head: 8.2 Ft
  • 1” Inlet(MPT)/1” Outlet(MPT)
  • Max Amps: .50
  • Motor Output: 1/38 HP


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 uses a custom pump design specifically for aquatic applications
  • Japanese pumps run cooler to the touch and slightly quieter, due to the thicker material


Iwaki Flow and Tech Specs


Quick Compare - Iwaki MD Pumps (Japanese Motors)

ModelPower UsageMaximum FlowMaximum HeadConnections

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”

More Information
Input Size 1.0"
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Product Questions

Im interested in this pump but Im curious as to why the outlet is skewed off to the side instead of straight up and down...

Question by: erick on Feb 10, 2017, 9:21 PM
Hey there! The position of the outlet is set in that orientation by the manufacturer, but it does not have to be used in that position. The great thing about this pump impeller housing is that it can be rotated to meet your needs! All you have to do is unscrew the housing retaining screws, rotate the housing to your desired direction, then screw it back on. :-)
Answer by: Randy on Feb 13, 2017, 10:56 AM
is pump good for a 90 gallon tank
Question by: owen on Apr 2, 2014, 1:36 PM
Hi Owen,
Assuming your not pumping some sort of unusually large distance (like up from a basement) then this would be a great choice and a pretty typical flow rate for a pump on a 90g tank.
Answer by: Bulk Reef Supply on Apr 2, 2014, 1:36 PM