Mercedes w124 w202 others windshield Washer fluid CAP (snap-on-type) w215 w221 Windshield Washer Reservoir Cap part# 124 869 02 72, size: 110 mm O.D. (about 4 3/8 Inch) Brand new, recently manufactured part, not old and cracking. Replace your missing or broken one with this fresh new one. These are actually very hard to find, believe it or not. And no, you can't fake it with a milk bottle cap, we've tried.