Salco Products (TMC20642) 20-Inch 6 Bolt Stainless Steel/ Carbon Steel Manway Cover with Pipe Nipple and a Mill Finish features a 1/2-inch thick, 316L stainless steel, manway dome and carbon steel manway ring welded together. The manway has six (6) 1-1/64-inch eye bolt slots on a 23-7/8-inch bolt circle with an AAR #1 style gasket groove. Also includes two (2) 304 stainless steel manway hinges, and 304 stainless steel manway safety stops. The Nitronic 60, 3/4-inch NPT, pipe nipple is 3-inches tall, and includes a 3/4-inch, 304 stainless steel, bee screen. Also includes a 3/4-inch NPT, 316L stainless steel, pipe cap assembly with a stainless steel chain assembly that consists of a 1/4-inch, 304 stainless steel, swivel link which is crimped around the plug, and is connected to a 1/4-inch, 18-8 stainless steel, chain of 4 links. Length from the center of the manway cover to the center of the hinge bolt holes is 14.5-inches. Fits Trinity OEM nozzle arrangement. AAR Approval # E-182114.