A medical connector for delivering a liquid at a high flow rate to a patient. The connector includes a gas inlet passage that is configured for connecting to a source of pressurized gas, a spike configured for piercing a stopper of a container, and a liquid outlet passage in fluid communication with the spike. The liquid outlet passage is configured for connecting to tubing through which the liquid in the container can be administered to a patient. The spike has a shield having a first closed end and a second open end such that the first closed end is breakable by the spike when the spike is inserted through the stopper of the container, and the second open end has an annular elastomeric member that attaches to the spike via compressive pressure applied by the annular elastomeric member.