'Mechanical Expansion Plug, T-Handle, Nominal Size (In.) 2-3/4, Min. Dia. (In.) 2.63, Max. Dia. (In.) 2.97, Max. Back Air Pressure (PSI) 5, Max. Back Pressure (Ft. of Head) 12, Material of Construction Brass, Zinc Plated Steel, Neoprene Rubber, For Use In Low Pressure seal in circular openings'