I had a Mag drive internally mounted in my sump. I didn't like the noise it produced so I started to research a quiter pump. I found that and more. These pumps are designed and built by a former chief engineer from Iwaki-Japan. They feature the same flow curves, high head pressure, low noise, and reliability that have made Iwaki the best magnetic drive pumps available. The BlueLine HD pumps are even slightly quieter than Iwaki, with a lower frequency. These units are yellow rather than green and carry a full 2 Year parts and labor guarantee. All seal-free bearings and magnetic drive for 10+ years of useable life. No seals to leak!