A dosing cap comprising: (A) a collar member having an annular skirt depending from a base , an inner surface of the annular skirt having a securing member for securing the collar member to a neck of a flexible container; (B) the base having: (i) a top surface and a bottom surface , (ii) a valve seat on the top surface , the valve seat having a center channel , and a radial channel , the channels extending through the base ; (C) a plug member composed of a polymeric material, the plug member having the following components in inter-connected relationship a head , a body , a leg , an ankle , and a foot ; the leg extends through the center channel , such that the head opposes the valve seat on the top surface and the foot opposes the bottom surface of the base ; (D) a cap member having an annular sidewall extending from a dispensing element , an inner surface of the annular sidewall having an attachment member adjustably attached to a reciprocal attachment member on an outer surface of the skirt ; (E) a metering chamber formed by an enclosed volume between the cap member and the base ; and (F) the dispensing element permitting flow of a fluid from the metering chamber , wherein the plug member is moveable between: an open position where the plug member permits fluid flow through the channels ; and a closed position wherein the flexible foot imparts a closed biasing force against the bottom surface of the base thereby: (i) forcing the head onto the radial channel to seal the radial channel ; and (ii) forcing the body onto the center channel to seal the center channel . (A) a collar member having an annular skirt depending from a base , an inner surface of the annular skirt having a securing member for securing the collar member to a neck of a flexible container; (B) the base having: (i) a top surface and a bottom surface , (ii) a valve seat on the top surface , the valve seat having a center channel , and a radial channel , the channels extending through the base ; (i) a top surface and a bottom surface , (ii) a valve seat on the top surface , the valve seat having a center channel , and a radial channel , the channels extending through the base ; (C) a plug member composed of a polymeric material, the plug member having the following components in inter-connected relationship a head , a body , a leg , an ankle , and a foot ; the leg extends through the center channel , such that the head opposes the valve seat on the top surface and the foot opposes the bottom surface of the base ; (D) a cap member having an annular sidewall extending from a dispensing element , an inner surface of the annular sidewall having an attachment member adjustably attached to a reciprocal attachment member on an outer surface of the skirt ; (E) a metering chamber formed by an enclosed volume between the cap member and the base ; and (F) the dispensing element permitting flow of a fluid from the metering chamber , an open position where the plug member permits fluid flow through the channels ; and a closed position wherein the flexible foot imparts a closed biasing force against the bottom surface of the base thereby: (i) forcing the head onto the radial channel to seal the radial channel ; and (ii) forcing the body onto the center channel to seal the center channel . (i) forcing the head onto the radial channel to seal the radial channel ; and (ii) forcing the body onto the center channel to seal the center channel . <EOS>