Principle Application: Various Detroit, Cat Diesel Engines - w/ standard drain - if self-venting drain required, use WF10045 or WF10014 (has self-venting drain and bowl attachment option) - (If base needed for this filter, use 24309) - can be used w/ diesel or gasoline - can use this filter along with base 24309 to convert cartridge fuel filters to the convenience of a spin-on or to add increased capacity and water removal capability to your existing fuel system