A tap lock has an engagement member, a barrier member, and a retainer member that extends between the engagement member and the barrier member and that retains the engagement member at a fixed position relative to the barrier member. The engagement member removably attaches to a support structure of a tap dispensing closure of a container body. The barrier member is disposed proximate an outlet passage and valve member of the tap dispensing closure. The barrier member limits movement of the valve member from a closed position toward an open position to prevent leakage of material from the outlet passage.