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The double manifold, also called vacuum gas distributaries usually used in Schlenk line. Both banks are made from 22mm medium wall tubing Ports are spaced 100mm center to center Hose connections have O.D. of 10mm at the largest serration. With 4-port 0-4mm high vacuum valves. Laboy glass flasks are heavy wall designed, made by hand-blowing to ensure uniform wall thickness, made of high-quality borosilicate glass and annealed at 800 degree Celsius, can be heated directly in an open flame and can withstand typical laboratory thermal variations in Chemistry processes like heating and cooling.