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.