is mounted in the base body 10 an outer shoulder 31 is formed around an outside wall of the inner shell 30 and abuts an annular edge of the mounting recess 22 of the bottom cover 20 a receiving recess 32 is formed in a top end of the inner shell 30 a through hole 33 is formed through a bottom of the receiving recess 32 an inner shoulder 34 is formed around an inside wall of the receiving recess 32 the time controlled apparatus 40 has a push rod 44 an adjusting rod 42 an elastomer 41 a gasket 43 and a collar 45 the push rod 44 has a top recess 441 being formed around an outside wall at a top end thereof a middle recess 442 is formed around the outside wall at a middle part of the push rod 44 an o ring 443 is mounted in the middle recess 442 the o ring 443 selectively seals the through hole 33 of the inner shell 30 the push rod 44 has a through hole 444 an aperture 445 is formed between the middle recess 442 and the top recess 441 and communicates with the through hole 444 an upper shoulder 446 is formed around an inside wall of the through hole 44 adjacent to the aperture 445 an inner threaded part 447 is formed on the inside wall of the through hole 444 adjacent to a bottom end thereof an outer threaded part 448 is formed around a.