The single specification that can make a camera useless in your pipe — and the one most buyers check last. Quick answer Match the camera head diameter to the smallest pipe on the run. As a working rule: 17 mm or smaller for 2 in lines, 23 mm for 3 in and 4 in lines,…

Choosing a sewer camera comes down to three questions asked in order: will the camera head fit the pipe, will the cable reach the far end of the run, and can you find the defect again from the surface. Head diameter sets the smallest line you can enter, cable length sets how much of the…