Just got a couple more boxes of CE2s and (5) of the new thicker tubes were part of the order - tried every drip tip I own and none fit - looks like they added the thickness to the inside which would suggest that the new fluxos, that I haven't tried yet cause my originals are still working so well, must have a skinnier base which means that the BD syringe will no longer fit - hopefully, the new tubes will negate the need to cut up BD syringes to replace the cracked originals - gonna miss my clear delryn tips though!!