RDA O ring sizes for a Steep vapor chuff caps?

[Evilcon666]

Two part question. What is the technical term for this? I feel like calling it a chuff caps isn't the right term?

Secondly what size are the O-ring for these things? Mines wearing out a bit and starting to wear.

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[eLicky]

Usually, I remove the o-ring and measure them up with some calipers, you want the width across and thickness in laymans terms, then I order them in from fast tech. You can also take that drip tip to a shop that sells seals, they'll measure it and supply you exactly the right one.