200mm 4nk Reaction Vessel Lid ,Each

Details:

Reaction vessel lid, 4-neck, 45/50 center neck, 3-29/42 side necks, 200mm schott flange^ 4-neck vessel lid to fit chemglass' cg-1920 through cg-1936 vessels. Lid has a flat ground surface allowing it to be greased or used with an o-ring