This flex bellow joint flex pipe has an inner pipe what keeps the gas flow straight and avoids the direct heat to the outer flex waves. But the inner pipe makes the inner diameter smaller, where we recommend to use always one size bigger than at the standard pipes. Completely made of Stainless Steel.

Material: stainless steel 1.4301 / SS304

Inner diameter: 1 1/2"(38mm) - 4"(102mm)

Length: custom designed