Red Floating Stick in Coolant Reservoir Housing

Does anyone know why my 2006 E90 330i doesn't have the red floating/measuring stick? I opened the reservoir housing to inspect the coolant level and of course it was low, but more suspicious to me was the fact the floating leveler wasn't there. I plan on doing a coolant flush soon, so is this something I can purchases and drop in or what do I need to do?



Thanks