Decided why not make a custom drip tip. Copied original measured designed and printed a few tests.

Came up with about 96% X and Y 100% Z for PETG
kept at full 100% with PLA and it fit snug.

Used two spare rubber o rings that came with the Mod Kit.

Drop below build plate and print just the part with the O Rings to test fit, took about 8 minutes.

I did like 5 walls and 50% triangles infil and 5 top 5 bottom layers, Seems pretty rigid!

for PETG I print pretty hot, about 245 on this roll, 50% fan at layer 5 and 50mms

(advanced settings shows everything but infil at 25mms, I slow infil down to 30mms)

Probably not a good Idea to use PLA it might melt from coil heat.

Should fit other tanks, the tank included in kit was the Upforce L Tank, has about a 12.2mm hole 5mm deep roughly.