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Detail of the turbine bulkhead showing the air pipe (large-diameter copper tubing) and the connection from the air flask section (fitting above air pipe).

High-pressure air from the air flask is admitted to the torpedo afterbody via the upper connection. The air flows through the preheater, where the air is warmed by turbine exhaust gas before being routed to the combustion flask and torpedo pneumatic system.

This photo was taken outdoors, looking in through a window.