A flexible elastomer closure plug mat presents a plurality of protruding hollow septa closure plugs depending from the mat's lower face. The mat and protruding closure plugs are preferably formed of silicone rubber, with a thick layer of polytetrafluoroethylene or TEFLON.RTM. durably
A flexible elastomer closure plug mat presents a plurality of protruding hollow septa closure plugs depending from the mat's lower face. The mat and protruding closure plugs are preferably formed of silicone rubber, with a thick layer of polytetrafluoroethylene or TEFLON.RTM. durably