The biggest drawback of any large job-site compressor is its weight and lack of portability. Ridgid designed the Tri-Stack compressor to be split in half for transport and use. The upper portion contains a pump, a motor, and a 1/2-gallon tank with its own regulator; the lower section consists of a regulator and a pair of 2-1/4-gallon tanks. The two parts connect without tools and can be used either together as a 5-gallon dual-regulated compressor or separately – the top for tasks that don't require buffer air and the bottom for work that can be performed with stored air alone.
¦ Price: $279. 800-474-3443. www.ridgid.com.