Small diameter and tight turn radius camera allows Lines up to 85ft (25 m) to be Inspected with tight turns Inches 1 Inch (25 mm) Lines. Lightweight and compact unit allows for easy transport and efficient storage. Inchesterchangeable drums let you change out the Inner drum dependInchesg on the application. L100/L100C 1 1/2 Inch to 5 Inch (40 " 125 mm) Lines with a stiffer push cable allowing you to Inspect Lines up to 100ft (30 m). D30 and D65S Small diameter with tight turns; 1 1/2 Inch to 4 Inch (40 " 100 mm) P-traps; toilet traps; pool Lines up to 65ft (20 m). N85S Ultra small diameter Lines 1 Inch to 2 Inch (25 " 50 mm) with tight turns for specialized applications