I have lost the top cap of my apple pencil. Where can i purchase it?

Here are some replacement caps here.

https://www.amazon.com/FRTMA-Apple-Pencil-Replacement-Pack/dp/B01N1N0VQ1/ref=sr_ 1_1?ie=UTF8&qid=1490585420&sr=8-1&keywords=apple+pencil+cap+replacement

https://www.amazon.com/FRTMA-Apple-Pencil-Cap-colors-Combo-Midnight/dp/B01JG5BPW Q/ref=sr_1_7?ie=UTF8&qid=1490585420&sr=8-7&keywords=apple+pencil+cap+replacement

https://www.amazon.com/Lightning-Power-Premium-Silicone-Replacement/dp/B01N0H18X Y/ref=sr_1_8?ie=UTF8&qid=1490585420&sr=8-8&keywords=apple+pencil+cap+replacement

https://www.amazon.com/Pencil-TechMatte-Silicone-Replacement-2-Pack/dp/B01M3TOC0 B/ref=sr_1_3?ie=UTF8&qid=1490585420&sr=8-3&keywords=apple+pencil+cap+replacement

https://www.amazon.com/3-Pack-FRTMA-Pencil-Lightning-Adapter/dp/B01KV3SBTW/ref=s r_1_9?ie=UTF8&qid=1490585420&sr=8-9&keywords=apple%2Bpencil%2Bcap%2Breplacement& th=1

Best Buy has some third party replacements

http://www.bestbuy.com/site/insignia-cap-for-apple-pencil-clear/5457800.p?skuId= 5457800

I'm sure you could also find them online

That is just a plastic cover that goes OVER the original Apple Pencil lightning connector protective cap of the Apple Pencil.

There is no Apple Pencil cap with this.

I've seen these.

The OP still needs a cap for the end of his Apple Pencil

Hi

Have a look on EBAY.

Cheers

Brian