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Small tip or small ferrule, or small mouthpiece, small end piece, small adaptor, ...?
Explanation: I think that the expression has a typo and should read "un petit embout", although "crital" has me stumped.
Un petit embout is "a small tip" or "a small ferrule" which is at the end of certain long objects such as a stick, a cane or an umbrella. The term is also used to designate the parat of a seringe where the needle fits. also, "un embout de caoutchouc" the rubber tip at the end of an electrical conductor. (This, I got from my Petit Robert dictionary.) I also remember seeing this term used to designate the mouthpiece that divers use for breathing.
If you look on the web, though, you will find many many different kinds of "petit embout" on many different kinds of apparatus, and maybe one of them will help you determine what they are talking about here.
I can't think of anything in a context of food or sex except for the tip of a seringe that is used to decorate cakes. Maybe when you find out what "crital" means, it will give you a clue. ( It should be an adjective, masculine singular, unless a word is missing.)