if in turne 2 during the recovery phase i flippe my firepits of apokolisps and pass it it to my opponen
and during turn 3 at the recovery phase i flippe an other firepits, if i pass it to my oppenet what will happend?

He has two Firepits in-play.

Your opponent is not considered to have played the location so it does not get KO'ed.

However, if your opponent flips his own Firepits, then he will have to KO the Firepits that you passed to him.