Salco Products (TI212304PA) 2-1/2-inch Stainless Steel Pipe Cap Assembly with Stainless Steel Chain consists of a pipe cap that has 2-1/2-inch NPT threads, and is made out of 304 stainless steel material. The width across the flats of the head is 3-inches. Length of the thread is 1.12-inches with the overall length of the plug being 3-inches. Comes with a stainless steel chain assembly that consists of a 1/4-inch, 304 stainless steel, swivel link that is crimped around the pipe cap, and is connected to a 1/4-inch, 18-8 stainless steel, chain of 15 links with an approximate length of 19-inches.