What are these plastic parts floating in coolant tank?

[Rob175]

Hummm....not sure about the accuracy of that reply. Typically the sensor is NOT in the tank....rather it sits in a channel molded into the bottom of the tank. If it needs to be replaced it can be pulled without ever draining the tank. The sensor does not use a "float" inside the tank, it's purely an electro magnetic wired sensor. It DOES NOT SIT IN THE TANK