Source for uncoated CSST?
I am going to be building a 3" CCVM column similar to Dad300's that a lot of people have probably seen from HD forum. I have seen these use corrugated stainless-steel tubing as a Dimroth style reflux condenser. From reading a ton of threads 5/8" CSST should work well inside of the 3" column and 1/2" CSST for a 2" column (see pic stolen from HD). This should be cheaper and a whole lot easier than winding copper tubing.
Has anyone actually made one of these and if so, where did you find the uncoated CSST? OR did you buy coated and strip it down. I'm only finding 1/2" yellow coated CSST (for gas lines) at places like homedepot. But can't find 5/8" coated or uncoated anywhere. Occasionally I will see 3/4" uncoated CSST for water heaters but not sure if that would be too big once wound into a Dimroth.