Corrosion-resistant coating protects from exposure to harsh cleaning & plumbing repair products; Stainless steel construction; Ranges, water heaters, dryers & cooktops up to 49,100 BTU; 100% leak tested; Approved for LP (propane) & natural gas; Approved for indoor & outdoor use; Designed, machined & assembled in USA; 1/2 OD x 72 (1/2 MIP x 1/2 MIP) ; ANSI z21.24/CSA 6.10 & ANSI z21.75/CSA 6.27;