Devices, systems, kits and methods are provided whereby a patient having a tracheostomy may use a respiratory therapy exercise device. The modular front end includes a bulkhead defining a plurality of integrally formed attachment mounts. The electrode passes through an opening in a wall of the tank so as to be immersed in the conductively heatable melt. After initiating the operation for translating the network element interface identification, an operation is performed for creating a designated root of a point-to-multipoint tree. The inverter core portion is configured to generate the internal clock signal through alternately supplying an electric current to the clock line and drawing the electric current from the clock line according to the input clock signal. The park plug includes a metallic shell coated with a composite layer which includes a nickel plating layer and a chromate layer formed on the nickel plating layer.