Twin Wall Insulated Flue Stainless Midtherm HT-S 130mm Internal / 300mm Length

HT-S is available in 125mm, 150mm, 175mm and 200mm. HT-S has a 0.5mm 316L 2B grade stainless steel inner liner with a welded seam, 25% thicker than most other twin wall systems on the market, 0.5mm 304 BA grade stainless steel outer casing with a welded seam and 25mm high density mineral wool insulation.

eBay