thereby causing smiley cut 211 to collapse sooner than it does in the scenario illustrated in fig6 a 6d in many uses both valve 210 and valve 710 are acceptable alternatives however in scenarios wherein syringe 510 includes a counterbore early collapse of smiley cut 211 may cause the top of valve 710 to fall forward and become lodged in the counterbore thereby somewhat impeding the flow of fluid such a scenario is shown in fig8 where the top of valve 710 is lodged in counterbore 820 of syringe 810 by contrast valve 210 delays the collapse of smiley cut 211 providing a more vertical collapse of smiley cut 211 and avoiding blockage of syringe counterbores thus in scenarios where a syringe includes a counterbore valve 210 can be employed successfully both valve 210 and valve 710 can be successfully employed in applications using a syringe such as that shown in fig5 7 various embodiments can use any angular displacement of a dimple relative to a cut with valve 210 and valve 710 illustrating two examples while valves 210 and 710 are shown with two dimples each various embodiments are not so limited for instance more dimples may be added and some embodiments may include only one dimple furthermore embodiments are not limited to the use of smiley cuts as other shaped cuts may be employed for instance fig9 a 9c show v cut 910 u cut 920 and u201c seagull u201d cut 930 which are but three examples of a wide variety of cuts that can be applied to embodiments as shown above various embodiments include valves with flat tops that facilitate flow around rather than through said valves such features provide advantages over embodiments that use hard plastic do not have flat tops and or allow flow through.