NBR-01 18mm to 12mm exhaust sensor bung reducer set

This Namz bung reducer set is an essential tool for custom exhaust setups or when fitting older pipes to newer machines. Sold as a pair, these adapters reduce the exhaust sensor thread from 18mm x 1.50 down to 12mm x 1.25, allowing you to use the smaller 12mm O2 sensors found on later models with exhaust systems designed for the larger 18mm sensors. They are ideal for 2012 to 2017 Softail and Dyna models being fitted with pre-2012 exhausts, as well as various custom applications. If you are working on a 2010 to 2016 Touring model, please note that an additional extension cable is required, which can be found in the 578303 kit.