Selkirk 7"/8" Reducer (Double Wall Stove Pipe - DSP)Selkirk 7" 8" Reducer Used to reduce the size of the pipe to the chimney. DSP Double Wall Stove PipeClose clearance, double wall connector used to connect a gas, liquid or solid fuel burning appliance to a chimney. DSP's better insulating value means superior stove performance. 6" to 8" Diameter: 430 Stainless Steel Inner Liner Aluminized Outer Wall 1 4" Air insulated 6" Reduced clearance to combustible Adjustable and Telescopic Lengths available for