C280 1996 Firewall coolant nozzle
 

My hose popped off this small nozzle located on the firewall just left of the steering wheel. it protrudes three inches at best into the engine compartment from the firewall. There was a coolant hose connected to this. It is deteriortating? Also it seems to be one piece, plastic collar and nozzle.
What is this? and how do I replace it? Jim

parts
 

there are two choices,depending on if your car has the heated washer bottle

with heated washer bottle 202-832-10-15

without heated washer bottle 202-832-11-15