@ MickiD - The Kayfun uses a "701" drip tip thread, But as far as I know, The Rocket uses the same threading as the CE5 style clearos, But their drip tips aren't directly compatible with the Rocket because the CE5 drip tips have that built in air tube below the threads.
The easiest option I can see would be to get a
CE5 to 510 adapter and cut the air tube down to just below the threaded area to make it fit.
Not the nicest option I know, But I can't see another adapter out there that would do what you need.
Reman.