With built-in thermostatic valve for precision cooling, correctly tailored to the engine's needs. This 566635 oil filter adapter is an optional part and designed to work with front engine mounted spin-on oil filters. Provides easy access to the oil lines for fitment of an oil cooler to Sportsters and Big Twin Evo models (excl. Fuel injected Evo's). Adapter allows the oil to flow through the filter before entering the cooler, resulting in less restriction. Note: See fmc-970-717 for upgrade nut, required for fmc-566-635 adapter when used with S&S engines.
Fits: > 84-99(NU)Evo B.T. (excl. fuel inj. models); 04-21 XL
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