Izzo Alex Duetto IV Plus Espresso MachineIzzo Alex Duetto IV Plus Espresso Machine The newly unveiled Izzo Alex Duetto IV Espresso Machine is the much anticipated follow up to the Duetto 3. 0 and 3. 0SS. It may feature the same aesthetic appeal, but it boasts a plethora of internal upgrades. Version 4 found a way to eliminate previous concerns that water might get into the motor through the pump by inverting the motor position. It features a new PID that integrates a shot timer, which allows