tender for one set consisting of two following items- 1. desiccator with cover knob tap,made from 3.3 borosilicate glass with porcelain separator size- approx. i.d.(internal dai) of ground flange 200mm = two nos. make- thermo fisher scientific/ borosil/ jsil. 2. desiccator with cover knob tap, madefrom 3.3 borosilicate glass with porcelain separator size- approx. i.d.(internal dai) of ground flange 250 mm =three nos. make- thermo fisher scientific/ borosil/ jsil.