Mechanical Expansion Plug, Snap-Tite, Nominal Size (In.) 3/4, Min. Dia. (In.) 0.719, Max. Dia. (In.) 0.810, Max. Back Air Pressure (PSI) 10, Max. Back Pressure (Ft. of Head) 25, Material of Construction Brass, Stainless Steel, Neoprene Rubber, For Use In Low Pressure seal in circular openings Package of 6.
eBay