A new method of replacing failed drain pipes relies on technology to open out the failed drains, coupled with a novel method of making replacement plastic pipe sections with moulded threads that can be screwed together and pushed into the holes. The process is exclusively licensed to Dyno-Rod by its creators, Ken and Elizabeth Scott, who are Dyno-Rod franchisees in St Just, Cornwall. Ken Scott told Eureka that he started work on the idea in 1993. The most crucial part of the development, he said, was the moulding process to make pipe sections with their moulded on threads. The pipes are made of polyethylene (PE) or polypropylene (PP), are 100mm or 150mm in diameter, but only 4mm thick, in order not to reduce flow. Since the pipes may have to be pushed into the holes against some resistance, and in order to maintain a good seal when installed, machine cut threads were not an option.
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