Woulff bottle, 500 ml, GL 45 with non-return valve, plastic coated

Woulff bottle, Erlenmeyer shape, 500 ml, with non-return valve, glass insert with screw-off plastic hose connections (PP) Ø 11 mm, integrated aeration valve, vacuum gauge with 2 scales (1000 - 0 mbar, 760 - 0 mm Hg), plastic coated for protection, borosilicate glass 3.3