Flat Cap - 42mm

I was a little worried the seal wouldn't be as tight as the original, but this replacement cap snaps on securely and doesn’t leak at all on my 3L container.

The threading lines up perfectly with my 3L container, no leaks even when it's tipped sideways in my pack. I was worried about fit since it doesn't work with the soft flasks, but it screwed on in two seconds. Solid replacement for the price.

Finally a cap that actually seals tight on my 4L Seeker without any leaks. The 42mm threading feels sturdy and it clicks on cleanly.