Could be a wine thief.
This is a bottling wand. It attaches via hose to the spigot, and has a spring on the valve to create a better seal. Most thieves tend to leak, and many won't fit inside a bottle. I'm assuming the one they gave you does, at least I hope so.
Logistically, I think it would be very difficult to bottle using a thief, and could create a big mess, with beer dripping everywhere. Plus, it's much harder to avoid the trub, which is probably why they said to rack to secondary. Not to mention the fact that the further down you get, the more draws it will take to fill one bottle. The time, mess, and headache you will save with a bottling bucket is well worth the small cost. I just don't want to see you getting fed up with bottling by making it harder than it needs to be.
Learn something new every day
