Central Interceptor highlights. This tunnel is 4.5 metres in diameter and will run for 14.7 kilometres from Grey Lynn under central Auckland and the Manukau Harbour to Māngere.
The tunnel will lie between 15 and 110 metres below the surface. The project, which is the largest wastewater project in New Zealand's history. FIP MEC supplies here dowels Biblock, guidance rods, grout sockets, pads and other accessories for tunnel lining segments.