A closure (10) for use with a beverage keg (20) is disclosed. The closure (10) comprises an inlet, a barrier (1) and a housing (2) that defines a venting hole (11). The barrier (1) seals the venting hole (11). The closure (10) comprises an unvented configuration in which a keg to which the closure is fitted can be pressurized. The closure (10) also comprises a vented configuration in which the barrier (1) is unsealed from the venting hole (11) to permit depressurization of the keg (20).