The 25-L high-output smoke fluid system from Superior Signal Company generates 4,000 cfm of smoke at 4 inches static pressure to push smoke through larger systems requiring greater volume and pressure. Engineered specifically for smoke testing, the system generates more dry smoke with less fluid, fits standard manholes, and has a nozzle for blowing smoke into pipes and special openings. Smoke testing helps eliminate surface inflow and other faults in sanitary sewer lines. 800/945-8378; www.superiorsignal.com.