Billet Aluminum Oil Cooler Sandwich Adapter. This kit allows for easy installation of any oil cooler. Adapter mounts between the block and oil filter and provides in and out ports to attach oil cooler lines to. Kit comes with -10 AN adapters & plugs for unused ports and works with 2-3/4" round filters. Supports blocks with M20x1.5 block fittings and oil filters with M20x1.5 or 3/4"-16 threads. Adapter is made of billet aluminum for strength and durability.