The Model 151 from Wallenstein Vacuum Pumps - Elmira Machine Industries can be used on portable sanitation tanks, slide-in units, campgrounds and marinas needing a compact package. It offers 80 cfm at 15 inches Hg, with a 2-inch vacuum/pressure valve, swivel elbows for easy hookup, air pressure or mechanical lubrication, and clockwise or counterclockwise operation. It can be direct-, hydraulic-, pulley- or clutch-driven. 800/801-6663; www.wallenstein.com.