A deep profile hollow void former to provide accurate electrical junction placements in precast concrete soffits and floor slabs. The two part system allows efficient flush fitting placements for electrical junctions, smoke detectors and lighting roses. All boxes are produced to match socket dimensions and fixing centres in accordance with BS4662:2006. For seamless cable routing use in conjunction with 25mm double skin flexible conduit EBC25 and slide nuts EB1224-99.