AN10 Oil Pan Drain Return Plug/Fitting for Turbo Application ALL NA to Turbo Conversion Projects Require to Drill a Hole on the Oil Pan and weld a plug/fitting for Turbo oil Drain. This Plug is a Bolt on Setup, does not need to weld. Only needs to drill a hole on the oil pan, and bolt it tight inside the oil pan and seal it. Fits AN10 Fitting.