Ace Race Parts 23714 Oil Drain Flange 5/8 Male Barb Extension with O-Ring Style Seating Surface (1.500 - 1.750 Bolt Circle)Ace Race Parts 23714 Oil Drain Flange 5 8" Male Barb Extension with O Ring Style Seating Surface (1. 500" 1. 750" Bolt Circle) The Ace Race Parts brand of Oil Drain Flanges are offered in a wide range of configurations. This particular Oil Drain Flange features an integrated 5 8" Male Hose Barb Extension Outlet and an O Ring Style Seating Surface to ensure a leak free connection at all times. This particular oil drain flanges features a 8AN Female ORB