Hi Toni,
Thank you for reaching out to us! The Crown III accepts 510 drip tips, so the Wide Bore Stainless/Copper/Brass Hybrid Column 510 Drip Tip should work great with it. There is some variation in size within 510 drip tips, and we do not carry the Crown III, so we cannot guarantee that it will be compatible; however, it is the correct type of drip tip for the tank, and it should work.
Best regards,
Brad