Looking for an EK-RES X3 Internal Tube

I was just refreshing my build, and my tube‘s threaded end cracked and broke right off in the multiport reservoir top. Guess it was brittle from all the years… Specifically looking for the 12/16 200mm version.

(I know EK is end-of-life, but I was hoping to scrounge up one somewhere!)

Alternative: Is it safe to run the loop WITHOUT the internal tube, and just sort of have the water fall from the top port; or am I cooked?

EDIT: Just in case anyone ever is trying to Google this exact issue—I ended up just Gorilla gluing the tube back together. It threaded back into the top just fine.