MARS - Motors & Armatures 12783 Round 35 + 5 uf MFD 440V VAC Motor Dua is a capacitor that helps to improve the start up torque of an electric motor. It also improves the efficiency of the motor by reducing the power losses. This capacitor is made of anodized aluminum which makes it resistant to corrosion. The product has a 4 terminal connection and it is easy to install.