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DUCT PROVING MANDRELS
Description
Proving Mandrels are used to test the circular integrity of a duct after back filling. A draw rope is first either blown into the conduit with air or pulled in using a fibre rod. Once attached the mandrel is pulled back through the conduit to ensure it has not been squashed. It is important to attach another draw line to the other end so if it gets stuck it can be pulled back out again, They range is sizes from 24mmOD to 140mm OD.
