the occluder drive mechanism 56 specifically a bearing 100 and a bearing 102 are each mounted on housing 30 and shaft 98 is slidably mounted on bearings 100 102 further shaft 98 is formed with a retainer ring 104 and a spring 106 is positioned around shaft 98 between the retainer ring 104 and the bearing 100 occluder 48 is mounted on the end of shaft 98 as shown and will reciprocate with the movement of shaft 98 fig5 also shows that slot 46 creates a platen 108 and includes a flexible cover 110 as intended for the present invention outlet tube 26 is positioned in slot 46 between platen 108 and flexible cover 110 as shown occluder 48 is positioned against flexible cover 110 on the side of cover 110 opposite outlet tube 26 with this structure a rotation of drive shaft 26 urges cam 88 against arm 94 to pivot the arm 94 around pivot pin 92 and into the position shown for arm 94 39 as a result end 96 of arm 94 urges against the abutment 112 on shaft 98 to move shaft 98 in the direction of arrow 114 and against the action of spring 106 consequently occluder 48 moves into the position shown for occluder 48 39 and the outlet tube 26 positioned in slot 46 will be opened for fluid flow further rotation of shaft 86 will release shaft 98 from.