the bladder causing a diaphragm 22 to extend and thereby to correspondingly move the shaft 6 and the liquid pick up means 4 fig4 shows still another embodiment of a cap incorporating the invention in this embodiment a single aperture 9 is formed at the side of cap 8 allowing a portion 7 of the bladder to be reached by the user only a single aperture is required to be formed in the cap as the needed compression force is developed between the exposed portion 7 of bladder 18 and the opposite surface interior to cap 8 against which the compressive forces on bladder 18 react this is a highly simplified design of a cap incorporating the present invention as will now be seen one can extend shaft 6 and brush 4 into the bottle by simple squeezing through either the aperture of cap 8 or flexible portions thereof so long as some pressure is maintained on the bladder 18 the brush will stay in its extended position if a plastic is utilized to form the bladder obviously the rate of return of the plastic to its prior position before squeezing will determine for how long a period brush 4 and shaft 6 remain in the extended position it is to be further noted that the degree of extension of shaft 6 and brush 4 is controlled by the dimensions of bladder 22 the bladder diaphragm combination 18 and 22 shown as separate parts in fig2 4 may be formed as one integral unit as shown in fig5 in fig5 numeral 25 denotes the squeezable portion of the bladder.