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One of the caps referred to by Will N has a wider "groove" for the seal to fit into. I think, but do not truly recall, that the later caps has the wider groove. Us the seal that fits best, ie, goes in with just some resistance. No need to jam a wide one in a narrow groove. Lots easier if you pre form the seal as JShaft says. I put mine in a tuna can, keep a couiple in there all the time.