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Hope I can shed some light on this question. As a utility Lineman I used several rodding trucks over the years. They are best suited for heavy duty ducts ceramic, cement, metal and if you're careful pvc.. Basically the 1/2" steel rod is sandwiched between two sets of rollers and in addition to moving in and out of the machine the coil can be spun on it's drum. A rubber reinforced steel hose of about 15' leads off the back of the truck and can be secured to the duct in a number of ways. A slow oil drip is added to the rod as you power it forward. A pressure guage lets you know how much resistance the rod is experiencing. If you hit an obstruction, you pull back a foot or two, put a spin on the rod and go forward slow! These machines are very strong and very dangerous, best to have one or two people at either end with good walkie talkies. Try to know your distance the machine has a counter. Frank.