The Caterpillar T660 2011 And Newer HVAC Pre-Filter Replacement is a practical and efficient solution for maintaining clean air in your vehicle. This replacement filter is sold individually and fits Caterpillar T660 2011 and newer HVAC pre-filters (CAB-19417). The filter is easy to install and does not require any additional housing. Keep your vehicle's air clean and running smoothly with this reliable replacement filter.