This is an extremely well made replica by CSF of the factory style RSR front oil cooler used on the 70's RSR race cars.  The cooler has M22x1.5 threaded ports and (2) M22x1.5 to M30x1.5 fittings are included.  These fittings have an 18mm I.D. so they are 2mm larger than a factory Porsche fitting.