Lid Lockscrew Clamp Catalyst chamber Rubber gasket seal 2H2+02-→2H20 Contains palladium pellets H2 C02 Oxygen is removed from chamber by combining with hydrogen to form water This reaction is catalyzed by the palladium pellets. Gas generator envelope Water is added to chemicals in envelope to generate H2 and CO2. Anaerobic indicator strip Carbon dioxide promotes more rapid 9 Methylene blue becomes colorless in growth of microorganisms. absence of O2. Anaerobic jarAnaerobic jar