Clarke 6911266 6" Stainless Steel Adjustable Twin Wall Flue Extension 75-350mm

A top quality stainless steel, high temperature insulated twin wall flue pipe, guaranteed for 10 years against defects due to faulty manufacture.
This stainless steel system consists of a 25mm high density insulated core surrounded by 316 grade inner liner is 0.
5mm thick, (25% thicker than some products) and the 304 grade outer casing is 0.
5mm thick, whilst extending between 75-350mm.
They are BSRIA approved to BS EN 1856 Parts 1 & 2 and HETAS approved for solid fuel burning.
It is supplied wi