Apparatus, methods and articles of manufacture for handling messages in a client-server environment. The flexible annular seal may include a flexible annular wall that permits relative deflection between the gas turbine engine and the exhaust nozzle to facilitate the reduction of undesirable load transfer. The wireless communication device receives an indicator. A control system may receive inputs related to system parameters and based on the inputs coordinates operation of the valves to confine and introduce the blowing agent dose. The fluid system can be an engine cooling system or other fluid system. When an external pipe is connected to the attachment connector to switch on the switch and the condensed water in the container gradually raises the float to switch on the float actuator, the drain motor is switched on to pump the condensed water out of the container.