... -proof hose that PLUG is 0.5 inch, stand pipe and oil outlet pipe docking flange.4, one ... on the manhole diameter is 108MM, and welded a 4 inch stand pipe high 200MM, must vertical with tank centerline ... , for a pair of standard 4-inch flange, one welded to the stand pipe and the other ... piece welded to the pump with the stand pipe. Flange butt installation.5, the oil port ...