I have a request from a customer that we observe D1.6 on a product we routinely build. I have D1.1 /D1.1M:2006, D9.1M/D9.1:2006. The job is largely stainless tubing walkway, stair, tank support commercial food and septic equipment with 2 and 3 inch .120 or .180 wall. We do not CJP tubing or piping. Can someone steer me to the correct D1.6? In the AWS Bookstore there appear to be 2 choices.

Stringer