Marineland PR2121 Impeller Assembly Emperor 400b Filter Parts for Aquarium

if your filter sound louder than before no matter how well you clean it...then this is the problem. fixed it right up

My Emperor 400 was loud when I changed out the old propeller for the new propeller it got nice and quiet thank you

Works better than my original did when it was new 10 years ago. Seems like a new design.

The impeller broke due to low water in the aquarium a school that hasn’t been visited in months. Fish still alive! This replacement works great and now the tank is quiet! The same Marineland 400 has been in the tank since it was purchased which was a number of years ago.

Great product at a great price.

Pure joy replacing my noisy old impeller. Worth every penny!

Just a perfect fit

Perfect replacement part. Filter is extremely quiet now.

new impeller, quieted the motor and improved flow.

Works instantly