Hart & Cooley RN Round Vent Increaser, 4 - 6 Inch, Aluminum Inner, G-90 Steel Outer, 4-13/16 x 6-1/2 Inch OD

Hart & Cooley RPC Round Vent Pipe Collar, 4 Inch, G-90 Steel, For Use with Type B Gas Vent Systems, 0.018 Inch T

Hart & Cooley RS Round Storm Collar, 4 Inch, G-90 Steel, For Use with Type B Gas Vent Systems, 0.018 Inch T

Hart & Cooley RSA Support Assembly, 4 Inch Dia, 4-1/4 Inch Skirt, Steel, For Use with Type B-Vent Systems, Galvanized

Hart & Cooley RT Round Gas Vent Tee, 4 Inch, Aluminum Inner, Steel Outer, For Use with Type B Gas Vent Systems

Hart & Cooley RTF Tall Cone Type B Roof Flashing, 4 Inch Pipe, Steel, Galvanized

Hart & Cooley RWT Adjustable Wall Thimble, 4 Inch, G-90 Steel, For Use with Type B Gas Vent Systems, 0.018 Inch T

Hart & Cooley 5400 Round Ring Collar, 10 Inch, Steel, For Use with T-Bar Diffusers, 0.18 Inch T, 14 Inch Dia

Hart & Cooley 5400 Round Ring Collar, 12 Inch, Steel, For Use with T-Bar Diffusers, 0.18 Inch T, 14 Inch Dia

Hart & Cooley 5400 Round Ring Collar, 6 Inch, Steel, For Use with T-Bar Diffusers, 0.18 Inch T, 14 Inch Dia x 2 Inch H

Hart & Cooley 5400 Round Ring Collar, 7 Inch, Steel, For Use with T-Bar Diffusers, 0.18 Inch T, 14 Inch Dia x 2 Inch H

Hart & Cooley 5400 Round Ring Collar, 8 Inch, Steel, For Use with T-Bar Diffusers, 0.18 Inch T, 14 Inch Dia x 2 Inch H