The X-Plug is a “patent pending” mechanical plug specifically designed and engineered to seal all types of formtie holes/voids. Thanks to the X-Plugs mechanical design tightening of the stainless steel nut causes an expansion of the EPDM rubber plug, increasing its diameter inside the formtie hole. This action simultaneously compresses the main body plug onto the bolt to create a liquid and watertight seal between the plug and the wall of the formtie void. Ideal for Any structure designed to be water/liquid tight e.g., water treatment plants, pump stations, reservoirs, dams, ground storage facilities, chemical treatment facilities, flood control structures and more.