Salco Products (TC156PA) 1-1/2-inch Stainless Steel Plug Assembly with Stainless Steel Chain that consists of a plug that has 1-1/2-inch NPT threads, and is made out of 316 stainless steel material. The width across the flats of the head is 1.37-inches. Length of the thread is 1.25-inches with the overall length of the plug being 2.25-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.