Hm. I'm afraid neither crock pot nor slow cooker are common Italian terms. In fact I googled some images and I have never seen that kind of appliance in Italy. Other users with greater cooking experience might contradict me, but I think a short explanation is needed in order for the general Italian audience to understand.
There was a thread about this sort of thing a couple of days ago. Someone asked about a fireless cooker, but we got onto the subject of crockpots and slow cookers (and you're right, no translation exists because you can't buy them in Italy!).