The PN23 vacuum pump from Jurop/Chandler Equipment offers 92 cfm at 18 inches Hg, with a maximum pressure of 21 psi. The air-cooled unit has a forced oil lubrication system with heat-resistant Kevlar vanes. The compact unit measures 8.46 by 18 inches, enabling it to fit on most portable restroom service vehicles. It has a built-in changeover valve, nonreturn check valve, built-in oil reservoir, positive displacement oil pump, and clockwise or counterclockwise rotation. 800/342-0887; www.chandlerequipment.com.