Amazon.com: DuraVent 55DF316-25KT 5.5" Inner Diameter - DuraFlexSS 316 Flexible Liner Chimney Pipe - Single Wall - 25' Tee Kit Includes Top Plate, Cap, Tee with Clean Out Cap and Flex Length :
DuraVent 46DVA-CT 4” x 6 5⁄8” 3-4 Co-Linear Termination Kit
M & G Duravent 6DP-06 6 Inch x 6 Inch Dura-Vent Dura/plus Chimney Length Inner Liner 430-alloy Stainless Galvanized Outer Wall - Walmart.com