In-Line Filter (IL-150) by ATP®. Standard. With 5/16" Double Barbs. Plastic Body. This Plastic Body in-line filter is an ideal way to add extra protection to automatic transmissions and/or power steering systems. It contains a magnet which attract ferrous particles and a 25 micron paper filter element traps the remaining non-ferrous particles. An internal pressure relief valve assures continuous full flow should the filter ever become clogged with contaminants. This particular filter is for 3/8" lines.