Buyers Products 12V DC Power Unit, Max. PSI 2500, Max. RPM 0, Power Source Electric, Model# PU642LRS is a powerful and efficient power unit that is perfect for a variety of applications. With a maximum PSI of 2500 and a maximum RPM of 0, this power unit can handle even the most demanding jobs. The electric power source makes it easy to use, and the compact design makes it easy to store.