Saint-gobain tigon S3 b-44-3 meets NSF - 61 Max temp 165° f meets 3 - a 20-this is some high grade food grade tubing. Inner diameter 1/2 in. Outer diameter 3/4 in. No never been used. 50 foot long. This can be used for different beverage making such as beer teas so forth look at the description in the picture from the website.