O-Ring, For Use With Acorn Penal Valves, For Use with Series Penal Valve Retro-Air Cartridge, Nitrile Rubber, Acorn Wash-Ware(R), Size 1/2 in ID x 3/4 in OD x 1/8 in Thick, Wash Fountain Gaskets and O-Rings, O-Rings, Package Quantity 10