c130nut, sears hardware sells corregated gas lines for stoves. they come in different diameters, but maybe not that small, possibly heavy too concidering you need 4 of them. You can also use aerotrends (the blue fuel line people) silicone exhaust tubing. they sell different dia.'s. But what your really looking (the aluminum flexible exhaust pipe/tubibg) can be found from the people who sells "see temp" the see through templates. I use them when I need to. I get them at NY's WRAM SHOW coming up in Feb.

Gunny