Narvi Pipe AdapterPipe Adapter 4. 5" Euro to 6" USA A sauna stove chimney pipe adapter serves as a connector or transition piece, linking a wood stove or heating appliance to a chimney flue or vent pipe. The primary function of the adapter is to create a smooth transition between the two pipes, adapting from 4. 5" (115 mm) to 6" (155 mm), ensuring the safe and efficient venting of exhaust gases and combustion by products. Available in various sizes and shapes to