1、[Perfect Compatibility] Model 21985798, compatible with for FM FH NH trucks, can replace part numbers 23871486, 23871480, 23013323, ensuring a perfect fit with your truck. 2、[Enhanced Performance] This piston cooling control valve provides ample power for your machinery, ensuring optimal performance. 3、[Premium Alloy Steel] Made from alloy steel, this valve has high hardness, allowing it to withstand harsh environmental and weather conditions. 4、[Fine Craftsmanship] This piston cooling valve is designed with advanced technology, providing stable performance and high efficiency. 5、[Simple Installation] This control valve is compact in size, standard and accurate, can be easily installed on your trunk for replacing original old ones.