Cooling cap for the oil filter. Dimensions are given in the last photo. Made of aluminum. The washer allows for easy and quick connection of the oil pressure and temperature sensor. It has all the necessary mounting elements with a gasket. The product is of the highest quality. The adapter has 4 holes for the sensor with a standard 1/8 NPT thread. The set includes 1 piece of adapter (to choose from): M18 M20 M22 3/4 UNF