The compact and easy-to-use PSM-500 tube cleaner is designed for quick, efficient cleaning of straight, small-diameter tubes, says the manufacturer. Suitable for the maintenance of heat exchangers, oil coolers, and condensers, the powerful unit cleans solidly plugged tubes from 3/16 to 1 in. (4.8-25.4 mm) id, says the company. According to the manufacturer, the PSM-500 is air-operated, and water is fed through a hollow drill to the cutting head, flushing out deposits as they become loosened. Goodway Technologies Corp., 420 W. Ave., Stamford, CT 06902-6384; 800-243-7932; 203-359-4708; 203-359-9601 (fax); firstname.lastname@example.org (e-mail); www.goodway.com (website).