9420 Impeller

[beto72]

What is the difference between the grey magnet and black magnet impellers? On the Tunze site the part 9420.047 is shown with a grey magnet and blue pinwheel. Is either impeller better then the other?

Thanks!

[rvitko]

The grey and blue ones are new, they are just now being phased in and the plastic is stronger and more durable.

[beto72]

Thanks!