The Nikon BF-3B Replacement Front Mount Cap for Nikkor AF-S Teleconverters replaces the BF-3A. It is a protective cap that goes on the front of your teleconverter. A tight seal, thanks to the bayonet lock, prevents liquids, dust and dirt from ruining your teleconverter. This cap is compatible with the TC-14E II, TC-17E II, TC-20E II and TC-20E III teleconverters.
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I recently purchased a used AF-S Teleconverter TC-14E II. The seller said the cap is very difficult to attach, which was true - it was nearly impossible. After a little research I figured out the private seller had provided a BF-1B, which can be attached with great difficulty, but it's not a proper fit. This BF-3B fits the TC-14E II perfectly and it's easy to attach and remove. Great purchase - I'm glad B&H had it in stock.
Genuine Nikon part, so of course it fits like it should.