A hydrogen peroxide delivery system for a sterilizer having a hydrogen peroxide injection unit and a housing is disclosed. The system includes a cradle for supporting a hydrogen peroxide solution container, a drainage arrangement for aspirating the hydrogen peroxide solution from the container, and a delivery arrangement for supplying the aspirated hydrogen peroxide solution to the hydrogen peroxide injection unit. The drainage arrangement includes a needle for penetrating a seal on the container and extending into the hydrogen peroxide solution in the container. A needle drive moves the needle from an at rest position, wherein the needle is retracted to allow insertion of a new hydrogen peroxide container into the cradle, to a penetrating position wherein the needle penetrates the seal of the container and extends all the way to the bottom of the container to ensure complete drainage of the hydrogen peroxide solution from the container.