Adjustable/Telescopic sleeve for cavity wall.to pass twin wall though.each section measures 280mm,both pieces extended toe to toe 750mm approx.
Nova SM Flue 45 deg elbow - 4575705N 130mm
Simpson Duravent Elbow Insulated 3" Double Wall 45 Deg. Steel
Genuine Intergas Flue Bend 45 deg
S Flue 5 “ 45 Deg Tee Twin Wall
Schiedel 45 Deg Trim Coller Chimney Systems
Worcester Greenstar Oilfit Flue Kit 45 Deg Elbow 80-125 7 716 190 035
