Piping gasket meaning

Hello all,

I’m trying to define a mapping between our own objects and IFC entities. I have a doubt about a mapping of one of our object. I’ll be glad if i can receive any advice for this.

Indeed, we have the object Piping Gasket but i don’t find corresponding entity in IFC.
Reminder about gasket’s purpose :
In piping, a Gasket is sealing material placed between connecting flanges to create a static seal. Commonly called as “join”.

What can i use as IFC entity for my Gasket ?

Thank you,