a first portion 62 and a second portion 66 the platform 64 is preferably disk shaped and serves as a shoulder for engagement by engagement member 44 the first portion 62 of the case 60 preferably surrounds a bottom portion of applicator 43 for example to hold the applicator 43 securely in place in a preferred embodiment the first portion 62 is narrower along its top section to hold applicator 43 in place the second portion 66 of case 60 is preferably mounted or affixed to dispenser 34 a rib 63 is integrally formed on the exterior of dispenser 34 in the embodiments of fig8 11 rib 63 is below flange 64 and slidingly engages the interior of insert 34 rib 63 contacts a downward facing retaining shoulder 65 formed in insert 24 while dispenser 34 is in a upper open position as shown in fig1 while in the closed position of fig1 rib 63 is spaced below retaining shoulder 65 as shown in fig1 and 11 when cap 16 is lowered and comes into full engagement with vessel 11 engagement member 44 contacts an exposed portion of platform 64 member 44 pushes down and places pressure upon platform 64 and forces case 60 downward as a result dispenser 34 is also forced downward inside of insert 24 and into increased engagement with seal 30 of insert 24 as a result of the increased force seal 30 of insert 24 will compress and stretch downward preferably the pressure placed upon seal 30 by the increased force will result in about 0 5 mm of stretching this stretching causes the.