This is a cutaway image of the Triplock crown. The image is from an unkown source. #4 is the external o-ring. #3 is the o-ring seal inside the crown #1-2 are the internal seals that wrap around the stem inside the tube. A twinlock crown does not have seal #4 aond only one seal around (#1) around the stem.

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Triplock Cutaway

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