Unique design prevents overfilling and air bubbles by turning the rotary switch. Suitable for most vehicles with added adaptors for Ford and GM vehicles. The 5" extensions are designed for hard-to-reach filling expansion bottles. Contents: Funnel with switch, Lid, Caps; Small, Medium, Large, Threaded Cap, GM Adaptor, Ford Adaptor, 5" Extension (x2), 45° Elbow (x2).