Patent ID: 7712744

Claim:
A gland plate comprising: a rigid, annular element comprising at least two axially spaced, radially extending walls having a thickness of from about 0.1 to 4 mm, the radially extending walls having a center orifice in the center of the radially extending walls and an outer circumferential perimeter extending around an outer edge of the radially extending walls; an outer wall extending axially and continuously between the radially extending walls and around the outer circumferential perimeter of the radially extending walls; an inner wall extending axially and continuously between the radially extending walls and around the center orifice; and at least one additional orifice formed in the at least two radially extending walls between the center orifice and the outer circumferential perimeter of the radially extending walls and defined by a first axially extending circumferential flange in one of the two radially extending walls and a second axially extending circumferential flange in the other of the two radially extending walls, wherein the first and second flanges are joined such that the first and second flanges extend around the at least one additional orifice and between the two axially spaced, radially extending walls, wherein the outer wall, the inner wall, and the first and second flanges together enclose a hollow interior volume between the axially spaced, radially extending walls.