have a hole 99 b on the corner between side 92 and side 95 and or the corner between side 93 and side 96 referring now to fig3 b 3d in another embodiment the base membrane portion 90 u2032 may be comprised of two separate triangular shaped portions 120 124 the first triangular shaped portion 120 may preferably be comprised of three sides 95 u2032 92 u2032 122 a tab 97 which may have a hole 98 and a side tab 99 a which may have a hole 99 b side 95 u2032 and side 122 are preferably connected by a tab 97 while side 95 u2032 and side 92 u2032 are preferably connected by a side tab 99 a the second triangular shaped portion 124 may preferably be comprised of three sides 96 u2032 93 u2032 126 a tab 97 which may have a hole 98 and a side tab 99 a which may have a hole 99 b side 96 u2032 and side 126 are preferably connected by a tab 97 while side 96 u2032 and side 93 u2032 are preferably connected by a side tab 99 a in an exemplary embodiment the first triangular shaped portion 120 and the second triangular shaped portion 124 are arranged to form a base membrane portion 90 u2032 the base membrane portion 90 u2032 may be substantially similar to base membrane portion 90 however base membrane portion 90 u2032 has a middle adjustment feature 130 which allows the fitment 40 to be adjusted when sides 95 u2032 and 96 u2032 are sealed to the top membrane portion 80 the middle adjustment feature 130 is preferably formed by the overlapping of side 122 on the first triangular shaped portion 120 and.