Selkirk 243248 Pellet Vent Adapter, 3"X 8"The chimney pipe adapter is used to transition from VP Pellet Pipe to Ultra Temp chimney pipe. It also increases the diameter. The VP Collection features proven coupling joint connects in seconds to assure joint integrity, gasketed joint design, painted pipe lengths available for interior use. The rolled over male end eliminates sharp edges, and internal spacing bead assures uniform insulating air space between pipe walls. VP pellet pipe works for