M20 x 1.5 oil filter sandwich plate thermostat switch kit. Powers electric fan when turn-on temperature is reached. 3 total ports for oil pressure or other temperature sensors. Sandwich plate installs between engine block and oil filter. Installs when gasket diameter of your oil filter is 3” or less. Features: (1) Sandwich Plate Adapter (3) 1/8 NPT Threaded Ports (1) M20 x 1.5 Thread (1) O-Ring for a Leak-Free Seal (1) Grounding Thermostat Switch