These high temperature Viton o-rings fit around the mouthpiece of the HVT Sai and New Sequoia Atomizers, allowing them to be simply mated up with most 18mm female joint water tools.
They can also be seated around the bottom air flow (BAF) Sai coils when using them in the New Sequoia to form a better seal if desired, as shown in the photo.
1 x Viton o-ring - 13x3mm