It is connected to the crankcase via a hose and allows excess gases, moisture, and other byproducts of the internal combustion process to be drawn out of the crankcase and into the intake system.
The TPS is a sensor located on the throttle body of a vehicle that monitors the position of the throttle pedal. Its primary function is to relay information to the engine control unit (ECU) regarding the Crankshaft Position Sensing of the throttle valve.