M & G DURAVENT 4PVL-A12R 4" x 12" Adjustable Pell Vent Pipe

4-D x 12"l, adjustable pellet vent pipe, adds 3" to 10" of length to 4" rigid pellet pipe, twist lock construction, can be used in both vertical & horizontal installations, 4-1/2" od, designed for stoves that burn wood pellets, double wall & air insulated pipe, inner wall of 012" super ferritic stainless steel, outer wall 018" laser welded galvalume, patent pending venting for stoves & inserts that use wood pellets, UL listed for 3" clearance to combustibles in USA & Canada, required for venting pellet appliance above 4,000'.