Is this the same thing as the gadget called a 'frothing jet device' in the Gaggia Classic Operating Instructions?
John is correct! Same product, different names. The Two-way Pin has a bunch of names, all of which mean "breaks down the laserbeam of coffee fired out of the pressurized filter basket."
Sorry misunderstood your question. Yes it is the same thing.
The little black pin on this page is what you are looking for:
Thanks everyone for the answers. I just ordered a couple of spares since the one I have keeps wanting to jump down the garbage disposal.
what is this for or what does it do?
The 2 way pin is for the pressurized Gaggia filter baskets. If you do not have a grinder and want to produce good creme this can help. Simply place in the portifilter handle and then add the filter basket. Here is a video that shows how it works: https://www.youtube.com/watch?v=DSZR7YwPFvA&list=PL818C139530D00316&index=8