Bench, or wall-mounting. Ensures continuity of gas supply to CO2 incubators by automatically switching supply between two cylinders as one becomes exhausted. Totally pneumatic operation, no electrical supply is required, however a battery- powered alarm indicates when cylinder change-over occurs. Otherwise coloured indicators show which cylinder is active. Pressure gauges indicate both separate inlet pressures an outlet pressure. Inlet pressure range 30 to 100 psi, outlet pressure 0 to 30psi. The exhausted cylinder can be disconnected and exchanged without disruption to the gas supply. Suitable for use with all non- corrosive, non-flammable gases. Standard outlet fittings are 3/8” male BSP. Unit only.