Opinion Needed: Coolant Tank Filler Neck Broken?

[Cp1]

i looked at that pic, it doesnt look bad at all. that black part that is worn is just foam that was put around the base of the filler tube and i honestly dont know why but if its not presently dripping or leaking its fine, the tank will out last most of the car but the clear PVC filler neck does get get more brittle with time but again if its not leaking your fine.

Test it by clamping the return hoses and filling it up into the neck.