德国采购需求：背包、腰包、袜子、运动服饰、登山杖、运动器材

I recently purchased five running flasks and have been really pleased with their performance. However, I've encountered an issue where all the silicone biting nozzles have developed cracks, which is quite disappointing since the flasks themselves and the plastic caps are still in great shape. I'm reaching out to see if there's a way to obtain replacement nozzles for these flasks. It's frustrating to have to replace the entire unit when only the silicone part is failing. Any information on how to purchase these nozzles would be greatly appreciated. Looking forward to your reply!