Jagg oil filter adapter / thermostat

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 970717 for upgrade nut required for 566635 adapter when used with S&S engines.