... (hydrogen, methane, ethane, ethylene, acetylene, carbon monoxide, carbon dioxide)6. Petrochemical Testing and Fine Chemicals (crude oil, gasoline, essence)Features1 ... automatically when cooling the column box, power data protection.6. GC9310 gas chromatograph with self-test function, when error ... gasket diameter 33nut M8x1 diameter 3.24nut M12x1 diameter 6.25nut M8x1 diameter 2.16microsyringe 0.5,1,10 ...