Rettberg Woulfe bottles, safety bottles made of borosilicate glass 3.3, for jobs using vacuum, with plastic coating as splinter and implosion protection, with 2 necks
Fittings: Suction tube with non-return valve, dial pressure gauge with 2 scales (1000 to 0 mbar, 760 to 0 mm Hg), integrated vent valve.