an end member for a container . the end member has a central panel wall with a public side and an opposing product side . the public side includes a means for opening a frangible panel segment . the member also has a score groove and a coin segment . the score groove is located on the public side of the end member and defines an outer perimeter of the frangible panel segment and separates the frangible panel segment from a non - frangible portion of the public side . the coin segment is adjacent the score groove and places a compressive stress on a portion of the end member located between the coin segment and the score groove wherein an upper plane and a lower plane are formed and separated by the score groove . the lower plane comprises a portion of the frangible panel segment adjacent the score groove .