Top Radiator Hose Collapses

Stant Manufacturing 10231 Radiator Cap STANT RADIATOR PRESSURE CAP -- 2-21/64 in. L x 1-13/64 in. H, 16lbs., vented cap.....
So tell me why when I went and looked at over 10 cars yesterday at a car show all had Stant 10230 Caps when you look up that part number it says its nother about being vented and all the caps I seen yesterday on all cars didn't have to word vent on the them and all had the part number 10230