DuraVent DuraFlex 4" x 70' 316 Stainless Steel Custom Flex Pipe Length btu47400 they differ in their designs

they differ in their designs

ECG02CW Color Cream White Body Construction Handcrafted glass-fiber reinforced concrete Burner Construction 16 gauge

Plug Location Left Side Cord Length 70

and two log set styles to choose from

DuraVent DuraFlex 4" x 70' 316 Stainless Steel Custom Flex Pipe Length btu47400 they differ in their designsDuraFlex 304 and 316 are lighter, more economical liners. Excellent when there are minimal offsets in the chimney. DuraFlex 304SS and 316SS are intended for wood burning, non condensing gas and oil fired appliances. Where greater corrosion resistance is desired, such as coal fired appliances, DuraFlex 316 is recommended. DuraFlex 304SS and 316SS are listed to UL 1777 and ULC S635. What's Included Flex Pipe Length (Custom) Features Available in 3" 8"