The Story
Full Send Diesel has specifically designed this -12 AN high flow fitting to prevent issues with oil backing up your S400 turbo. These high flow drain fittings are punched out as large as possible and feature a smooth contour on the inside to increase oil flow and reduce restriction. If -10 AN drain seem to not flow enough, the use of a -12 AN will solve your oil flow problems. Full Send Diesel offers the largest inside diameter -12 AN drain flange on the market.