Twin Walled Underground Burial Conduit Twin-walled underground burial conduit has a corrugated exterior and a smooth interior core. Manufactured from HDPE by a twin-extrusion process, two pipes are extruded simultaneously (one inside the other) and heat-welded in one continuous process. Its flexibility and mechanical resistance allows installation even in the presence of irregularity in the ground as well as having high resistance to chemicals and water ingress. All coils of UGC-Series are supplied complete with draw-cord pre-installed throughout and one conduit coupler per coil. BBA Approved Manufactured to Highways Specification Manufactured to BS EN 61386 UGC-040 - 32mm Internal - 40mm External - 50 Meter Coil UGC-050 - 40mm Internal - 50mm External - 50 Meter Coil UGC-063 - 50mm Internal - 63mm External - 50 Meter Coil
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