[Deep18]

Originally Posted by Tools

When the crown is unscrewed, it does not leave an open hole to the environment. While, over time and motion, it is possible for something to migrate past the seals that are inside the tube, it is not a common event.

Here is a diagram. for a Twin lock, there is one less o-ring in the tube, but it does have the primary inner o-ring seal, which clearly states that it is active even with the crown unscrewed.

Attachment 1156973

Awesome diagram.