Kwikon's Standard Slab Boxes are ideal for parkade, apartment and office building construction. Manufactured from PVC, Kwikon ENT slab boxes are nonmetallic, nonconductive and non-corroding, and are engineered tough and completely concrete-tight. No more stuffing boxes with paper to keep concrete out. Slab boxes are supplied as a fully assembled one-piece unit. All molded connectors have 360° locking tabs that exceed UL and CSA requirements for pull-out.