Salco Products (TC2N60P2A) 2-inch Nitronic 60 Plug Assembly with Stainless Steel Chain consists of a plug that has 2-inch NPT threads, and is made out of Nitronic 60 material. The width across the flats of the head is 2-1/8-inches. Length of the thread is .81-inches with the overall length of the plug being 1.94-inches. Comes with a stainless steel chain assembly that consists of a 1/4-inch, 18-8 stainless steel, swivel link that is crimped around the plug, and is connected to a 1/4-inch, 18-8 stainless steel, chain of 15 links with an approximate length of 19-inches.