Maxi -Jet replacement "Power Head" Impeller Assembly for the 400 Pro Power Head Part # ML90516.
 
Note* If you are running your pump as a "Circulation" pump the part is Part# ML90520
 
This Impeller will NOT work with the OLD STYLE Maxi-Jet Pro Power Heads. The OLD STYLE Max-Jet Power Heads have "Made in Italy" written on them.