Thermostatic Oil Filter Sandwich Plate Adapter Application: 3/4"-16UNF and M20x1.5 bolt fit most Japanese car Description: The valve is shut below 70 C (158 F) and smoothly opens completely at 80 C (176 F), to insure optimal oil temperatures. 10AN fittings are a common size used by most oil coolers. Ideal for custom oil cooler kit.