Humminbird 7400721 MS PPM Portable Case Lock Down Mount Optional mount system that can be used for second mounting location on boat Acts as ideal replacement for worn original Secures Piranha portable case to a surface For use with Piranha 1 Portable, Piranha 4 Portable, PiranhaMax 10, PiranhaMax 15, and PiranhaMax 20 One year limited warranty