The Model 151 from Elmira Machine Industries / Wallenstein Vacuum can be used on portable sanitation tanks, slide-in units, campgrounds and marinas that require 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.