Here we have a set of O-rings / Seals for the SMOK TFV4 it includes the 2 main orings that cause problems,
Bottom T style O-ring
Large vented seal for the flip round top section under drip tip
This set actually fixed my leaking problems with my TFV4 much more robust and better fitting bottom o-ring than the original.
THIS IS FOR TFV4 FULL SIZE ONLY