A metered dosing assembly (2) configured to dispense a volume of fluid into a container (4) that is selectively sealed by a closure valve (6) having a closure valve member (18) that is movable between sealed and unsealed positions with respect to the container (4). The metered dosing assembly (2) includes a housing (10) having an interior cavity. A valve (14) is locatable at an end of the housing (10). The valve (14) includes a valve member (46), a pin (32) extending from the valve member (14), and at least one spring leg (48) attachable to the valve member (46). The pin (32) extends from the valve member (46) and is configured to engage the closure valve member (18) of the closure valve (6) to move the closure valve member (18) to the unsealed position and move the valve member (46) to an open position with respect to the housing (10). When the valve member (46) is moved to the open position and the closure valve member (18) is moved to the unsealed position, fluid communication is made between the metered dosing assembly (2) and the container (4).
