Photo 1 of Metal-Fab 4" x 12" Adjustable Length Type B Double Wall Round Gas Vent Pipe UL Listed with SureLock Technology (#4M12A)

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Photo 1 of Metal-Fab 4" x 12" Adjustable Length Type B Double Wall Round Gas Vent Pipe UL Listed with SureLock Technology (#4M12A)Photo 2 of Metal-Fab 4" x 12" Adjustable Length Type B Double Wall Round Gas Vent Pipe UL Listed with SureLock Technology (#4M12A)