Zoeller 161-0024 Model N161 High Head Effluent Pump 0.5 HP 115V 1PH 50' Cord NonautomaticZoeller Model N161 High Head Effluent Pump Description Our Model N161 nonautomatic Effluent Pump is designed to remove effluent or ground water in septic or effluent applications. The 1 2 HP N161 is a time tested and reliable effluent pump. The N161 is a nonautomatic pump requiring a piggyback float switch or control panel for operation. Either option allows you to set the on and off point of the pump in the field. This is ideal in an application with