to select suitable sizes and locations for the apertures 22 so as to achieve the effect of a fine shower of liquid emerging from a substantial portion of the undersurface of the cover 20 such that the ground coffee beans in the basket 36 are soaked without significantly agitating them as it is being soaked and infused since the ground coffee beans are unlikely to pass through the screen 40 the apertures 42 of the screen 40 will remain covered by them during the infusing process and hence air in the region 70 underneath the basket 36 will be prevented from escaping while liquid is being poured into the vessel 14 as the remainder of the liquid enters the vessel 14 through the cover 20 the ground coffee beans will continue to cover the screen 40 with the effect of causing the pocket of air to remain trapped in the region 70 hence there results the situation in fig6 which remains the case until action is taken by the user to release the pocket of air in a specific scenario shown in fig7 the user pushes the handle 32 towards the cover 20 which causes the basket 36 to move towards the bottom 24 of the vessel 14 it is recalled that the.