This is a 3 terminal brake light switch for vehicles with brake warning light on the dashboard.
Screws in to the master cylinder
Type 1/Beetle 1970-79
Karmann Ghia 1970-74
Type 2/Baywindow 1970-79
Type 25 1980-91
Type 181/Trekker 1973-74
Also fits many Golfs, polo's, Audi, early Porsche's