Aluminum Waterblasters from Simpson are designed to provide commercial-grade cleaning at a lower weight. Frames are constructed from aircraft-grade aluminum and can be topped with Honda or Simpson engines. Waterblasters are rated from 3,200 psi at 3 gpm up to 4,400 psi at 4 gpm. Other features include AAA or Cat triplex plunger pumps, thermal relief valve and detergent injection system. 847/348-1500; www.simpsoncleaning.com.