Woulff bottles Erlenmeyer pattern (5000 ml is bottle-shaped), with reinforced wa ls, for work under vacuum and plastic coating to act as a splinter and implosion rotection. A glass insert is fitted with removable PP tubing connections, vent v lve head and analogue pressure gauge with 2 scale ranges (1000 to 0 mbar, 760 to mm Hg). Capacity 20000 ml, Dia. 290 mm