Does a can opener need tevila?
No. Since it does not touch food, it does not need tevila [and even though some times it touches the food a little, since one does not intend for it to touch it doesn’t matter].
חוט שני (טבילת כלים עמ’ מ), ספר טבילת כלים (כהן, פי”א סעי’ קעא) בשם הגר”ש ואזנר
