Two-piece, full tension HYSPLICE™, consists of aluminum outer sleeve and steel inner sleeve. Tapered outer sleeve provides gradual transition of stress. Filler holes provided for PENETROX™ joint compound. Sizes 1/0 and larger supplied with plugs for filler hole. Installed with standard HYSPLICE™ tools and dies (thru 556 with Y35 or Y750 HYPRESS™). Aluminum and steel sleeves can be ordered separately or in sets.