One workhorse of the ETA mechanical line is the ETA 2824-2, The 2824 is an automatic winding, twenty-five jewel movement, available in four executions or grades: Standard, Elaborated (improved), Top and Chronometer.
The Breather Valve is a protection device mounted on a nozzle opening on the top of a fixed roof atmospheric storage tank. Its primary purpose is to protect the tank against rupturing or imploding.
2) An exhaust damper (a.k.a. flue, vent, or chimney) that exhausts gases and pulls in oxygen through the intake dampers. The intake damper is near the charcoal or wood and its job is to provide them with oxygen. The intake damper is the engine that drives the system.