Woulff bottle, Erlenmeyer shape, made of borosilicate glass 3.3 (from 3000 ml shape), thick walls, for jobs using vacuum, with plastic coating as splinter and implosion protec-tion, glass insert with screw-off plastic hose connections (PP), intermediate piece with vent valve, pressure gauge with 2 scales (1000 to 0 mbar, 760 to 0 mm Hg). Also available with non-return valve at the side. Woulff bottle, Erlenmeyer shape, made of borosilicate glass 3.3 (from 3000 ml shape), thick walls, for jobs using vacuum, with plastic coating as splinter and implosion protec-tion, glass insert with screw-off plastic hose connections (PP), intermediate piece with vent valve, pressure gauge with 2 scales (1000 to 0 mbar, 760 to 0 mm Hg). Also available with non-return valve at the side.