The old design had a center plug which was used to seal the tank which connected to the cap so when unscrewed the plug rotates and at the same time lifts out of the expansion tank. . This caused the fork to break after too many disassemblies. I went through two covers this way. With the new design, the plug is not fixed to the cap, so it only moves in and out of the reservoir when the cap is tightened or loosened, rather than rotating. Works much better.
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