GReddy Engine Oil Block Adapter M20 x 1.50 -10AN Fittings Greddy oil block adapter with built in thermostat to be used with an external oil cooler. Threaded -10AN fittings are a common size used by most oil coolers. Built in thermostat allows the engine to warm up faster. This helps keep engine wear to a minimum. Notes This unit is universal and requires that you have knowledge and experience making your own oil cooler setup. 10 AN fittings for oil in and oil out ports. Fits S14 SR20DET engines (M20x1.50 PORT *some modification for fitment may be needed* 3/4 x 16UNF on one side of the filter adapter, the other is M20 to match the original engine thread. Please make sure to purchase a 3/4 x 16 UNF filter.