SELKIRK CORP 244460 4-Inch Pellet Wall Thimble Product Overview 4" inch, 4VP-WT, Pellet Wall Thimble. Type L pellet vent must be used for all through-the-wall installations, involving combustible construction. Maintains airspace clearance with combustibles and centers the pipe between the walls. Telescopic design can be used on standard walls 5" to 9" Inch thick. Rolled over male end eliminates sharp edges and internal spacing bead assures uniform insulating air space between pipe walls. From the Manufacturer 4" inch, 4VP-WT, Pellet Wall Thimble. Type L pellet vent must be used for all through-the-wall installations, involving combustible construction. Maintains airspace clearance with combustibles, and centers the pipe between the walls. Telescopic design can be used on standard walls 5" to 9" inches thick. Rolled over male end eliminates sharp edges, and internal spacing bead assures uniform insulating air space between pipe walls. Details: Part Number: 244460 Item Weight: 1.6 pounds Product Dimensions: 10 x 10 x 4.5 inches Item model number: 244460 Item Package Quantity: 1 Batteries Required?: No Shipping Weight: 1.6 pounds Domestic Shipping: Item can be shipped within U.S. Date First Available: February 9, 2011 Features: 4" inch, 4VP-WT, Pellet Wall Thimble Type L pellet vent must be used for all through-the-wall installations, involving combustible construction Maintains airspace clearance with combustibles and centers the pipe between the walls Telescopic design can be used on standard walls 5" to 9" Inch thick Rolled over male end eliminates sharp edges