Protection conduct for buried cables, electrical, gas, water, communication,
Especially designed for double wall corrugated pipe, the belling system is part of the corrugator.
Mould blocks chain has 2 or 3 dedicated moulds receiving the socket shape in addition to the air (management control) system for the air flow regulation between inside and outside wall.
Then a cut is done in the middle of the socket.
The double wall belling system