Salco Products (TMC2064201) 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. Length from the center of the manway cover to the center of the hinge bolt holes is 14.25-inches. 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 and 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 14.25-inches. Fits Trinity/ GATX OEM nozzle arrangement. AAR Approval # E-182114.