Engine coolant is probably the most overlooked fluid as far as servicing is concerned. Most will only check coolant after a problem as already occurred. Engine casting sediment and metal shavings get left behind in engine blocks and can make their way to vital components such as EGR coolers, water pump, and any other engine component that has coolant running to it. Protect your engine with the Sinister Diesel Coolant Filtration kit. This kit is designed to bypass and filter small amounts of the engine’s coolant while your diesel engine is running. The CNC machined billet 6061 aluminum anodized construction filter block attaches to a supplied bracket, which mounts to factory holes, so no drilling is required. The cooland filtration block includes 2 threaded inlet ports and 1 outlet port. This kit includes all fittings needed for installation. The filter can be easily unscrewed for replacement. We recommend replacement of the first filter at 500 miles with replacement of the second and third filters is at 3,000 miles each. After 3 changes, filter replacement can be done once a year. The silicone hoses fittings are pre-assembled for simple, leak-proof connections that factory tested at twice the recommended radiator cap pressure.