Selkirk 3 in. D Galvanized Steel Wall Thimble

Selkirk VP pellet pipe thick wall thimble is used to provide the required 3 inch clearance to combustible materials. Thimble expands from 6-1/2 inch to 11 inch thick. Features proven gasketed coupling joints that connect in seconds to assure joint integrity. Available in 3 inch and 4 inch diameters of 304 stainless steel inner wall and paintable galvanized outer wall. Internal spacing bead assures uniform insulating air space between pipe walls and allows for 3 inch clearance to combustible materials. Male end is rolled over eliminating sharp edges.