Danner / PondMaster Model 18 "Fractionating" Impeller Replacement Part# 16775
This Fractionating Impeller Assembly can be used to replace the stock impeller for a Supreme Magnetic Drive 18, or Pondmaster Pond Mag 18 pond pump.  When this impeller is used in conjunction with the Pondmaster 9.5 - 18 Venturi Assembly, the pump can be used effectively with a protein skimmer or for aeration.
 
*Note - Venturi assembly not included sold as part # 16705