Gecko Alliance 91693551 Standard Flow Impeller For 3/4HP Flo-MasterHP/CP & Circ-MasterHP/CP Pumps. This item is a replacement part for use with Gecko Alliance 3/4 HP Flo-Master HP/CP and Circ-Master HP/CP Pumps. This is a genuine Gecko Alliance part, designed to provide Gecko Pump owners with the same reliability they have come to expect. Easy to install, Gecko Alliance parts are made with premium materials and can be trusted to deliver high quality performance and efficiency.