Allows in-slab ceiling drops and floor mounts in poured concrete as well as pre-fabrication of in-slab conduit systemSlab insert is nailed to form prior to pourRemovable seal keeps threads cement freeESL eliminates bends in 4 in concrete slabs, damage to form, cutting Off conduit stubsFlush design leaves no broken or bent stubs for easy removal of undamaged formsFlush design permits simplified in-slab workFlush design leaves a neat, uncluttered jobPrecision cast and machined surfaces permit safer wire pullingZAMAK 3 zinc can be embedded in concrete