Do you have a 150 mm ice cream cup, but over time or during installation, the plexi tube no longer looks nice and has scratches? Or do you have the 250 mm version and would like to add another radiator to the case, but find that the expansion tank is too large, or you simply want to switch to the 150 mm version? No problem. Just remove the scratched or "too large" plexi tube and screw on the new one. Done. The pump base and the lid can easily be reused.