40 and the diameter of the central opening 48 are substantially the same further the axes of the tubes 12 and 40 are coaxially aligned with one another and adapted to be placed in coaxial relation with the center of the central opening 48 the valve plate 46 is mounted in the housing 36 for movement between first and second positions and in a direction that is transverse to a common center axis through the tubes 12 and 40 in the first position as illustrated in fig2 the central opening 48 of the plate is not aligned with the tubes 12 and 40 and the valve plate 46 prevents fluid from flowing between the tubes 12 and 40 in the second position as illustrated in fig3 the central opening 48 is aligned with the tubes 12 and 40 and the valve plate 46 permits fluid to flow between the tubes 12 and 40 the valve plate 46 is in fluid sealed relation with the tubes 12 and 40 in either of the positions as illustrated in fig2 and 3 an annular o ring 50 seals the interface between the valve plate 46 and about the end 44 of the supply tube 40 and an o ring 52 seals the interface between the valve plate 46 and about the proximal end 16 of the tube 12 so connected the end faces of the tubes 12 and 40 are juxtaposed in sealed relation against the opposite planar faces of the valve plate 46 according to this invention the squeeze bulb 34 includes a central reservoir 54 and an attachment stub 56 the reservoir 54 is dimensioned to receive a suitable volume of fluid and the stub 56.