Iwaki RD-40V24-HN1V Direct Drive Pump. Includes the RD0031 500mm connector. This model requires a 24vdc source voltage and has the high temperature (0 - 80C) and input signal (1-5vdc) options. The input voltage allows you to control the pump speed. It also has the FKM O-ring option. The suction side is 1 inch male NPT and the discharge side is 1/2 inch male NPT.