Ward 15A.WF500 1" x 500 Corrugated Stainless Steel Tubing. Ward 15A.WF (CSST) Corrugated Stainless Steel Tubing is a must have for installation of gas appliances. CSST has a special design that makes it ideal for attic and crawl spaces, bends, and stubbing through walls. CSST is not only lighter, less expensive, and more flexible, but it also has higher ratings than steel pipe.
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