Metalbest FX7 PD Flexible Liner Aluminum AFCL Vent Pipe Flex Puller 7" Stainless Steel Aluminum Pull Down Installation ConeUse a pull down to guide the flex liner through the masonry chimney Pull downs can be used with either aluminum or stainless steel flex liners Simply attach a pull down to the liner with screws and thread a rope through the loop before dropping a liner down a chimney from the roof Pull on rope as required until the liner is all the way through Features:Materials: Aluminum 3003 2 ply (0 005" each)Fuels: GasTemperature: 470 degrees FUL Listed: UL 1777Warranty: Lifetime Limited Warranty