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The TankGuard™ automatic tank switch has been designed to provide reliable service to perform the critical backup gas (i.e. CO2, N2) tank switch for a tissue cell culture incubator. The TankGuard™ tank switch continuously monitors and indicates the selected source gas tank and the status of the non-selected or secondary source gas tank. If the selected source gas tank pressure falls below 8 PSI, the selected source internal pressure switch will detect the low pressure and automatically change sources.