Jagg Upgrade nut for use w.S&S motors

The #4550 is an updated version of the #4400 oil filter adaptor. It is designed to work with front-mounted spin on oil filters. Provides easy access to the oil supply for fitment of an oil cooler on all Evolution Sportster, air cooled Buells and carburated Evolution Big-Twins. The built-in thermostatic oil valve allows oil to by-pass the oil cooler until reaching operating temperature for faster vehicle warmup times. Installation on S&S engines requires the use of a special adaptor nut ZPN740091 that must be ordered separately.