This is an OEM AC switch that came in the factory installed BEHR AC system in early Bmw specifically E 21 era vehicles. The switch is missing the tube that runs into the the evaporator, but any simple brass piping can be re-braised to the switch. This does not affect the functionality of the switch itself the switch still functions properly and retains the OEM style knob. That is extremely difficult to find if you are a pest or someone restoring your early year Bmw ! that’s equipped with a behr AC system. You will likely need this part down the road. I have had many offers to sell just the knob alone for 100+ by the knob you get to switch for free.