This is a product that fills needs I didn't even know I had. While the plastic part is a bit pricey, it fits nicely into the battery contact plates on the back of the eTap switches. Ideally, it protects these areas when washing or transporting the bike. While I haven't heard of any problem with it, I think it protects the tabs that hold the batteries in place from breaking or becoming detached, so it's a valuable help.
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