A pressure relief device (70; 70a) comprising: a rupture disc (30; 30a) including a central rupturable portion (68; 68a) and a circumscribing flange section (74; 74a); and a rupture disc support member (32; 90) including an annular inner hub (46; 92), an outer peripheral portion (48; 94) radially spaced from said inner hub (46; 92), and one or more connector segments (50; 96) extending between said inner hub (46; 92) and said outer peripheral portion (48; 94), said connector segments (50; 96) defining one or more relief areas (56; 102) formed by recessed pockets or by apertures (56; 102) located between said inner hub (46; 92) and said outer peripheral portion (48; 94), wherein the pressure relief device (70; 70a) further comprises an elastomeric annular gasket (20; 20a) having adjacent plies (22, 24; 22a, 24a), wherein said support member (32; 90) and said rupture disc (30; 30a) are inserted between said adjacent plies (22, 24; 22a, 24a) of said elastomeric annular gasket (20; 20a) prior to installation in a pressure relief device holder (14, 16 and 18), characterized in that said one or more relief areas (56; 102) are adapted for receiving respective portions of said elastomeric annular gasket (20; 20a) upon installation in said pressure relief device holder (14, 16 and 18), and in that compression of the pressure relief device (70; 70a) by the action of said pressure relief device holder (14, 16 and 18) results in deformation of said circumscribing flange section (74; 74a) into said one or more relief areas (56; 102) such that said circumscribing flange section (74; 74a) becomes embossed with a pattern of segments that dimensionally correspond with said one or more relief areas (56; 102). a rupture disc (30; 30a) including a central rupturable portion (68; 68a) and a circumscribing flange section (74; 74a); and a rupture disc support member (32; 90) including an annular inner hub (46; 92), an outer peripheral portion (48; 94) radially spaced from said inner hub (46; 92), and one or more connector segments (50; 96) extending between said inner hub (46; 92) and said outer peripheral portion (48; 94), said connector segments (50; 96) defining one or more relief areas (56; 102) formed by recessed pockets or by apertures (56; 102) located between said inner hub (46; 92) and said outer peripheral portion (48; 94), wherein the pressure relief device (70; 70a) further comprises an elastomeric annular gasket (20; 20a) having adjacent plies (22, 24; 22a, 24a), wherein said support member (32; 90) and said rupture disc (30; 30a) are inserted between said adjacent plies (22, 24; 22a, 24a) of said elastomeric annular gasket (20; 20a) prior to installation in a pressure relief device holder (14, 16 and 18), characterized in that said one or more relief areas (56; 102) are adapted for receiving respective portions of said elastomeric annular gasket (20; 20a) upon installation in said pressure relief device holder (14, 16 and 18), and in that compression of the pressure relief device (70; 70a) by the action of said pressure relief device holder (14, 16 and 18) results in deformation of said circumscribing flange section (74; 74a) into said one or more relief areas (56; 102) such that said circumscribing flange section (74; 74a) becomes embossed with a pattern of segments that dimensionally correspond with said one or more relief areas (56; 102).