After the plug of the "old" trailer (7-pin) is no longer "new" port of my new car (13-pin) adapted the, needed a Adapter. I have discovered this adapter at Amazon - but not bought the same, but wanted to get me the thing faster at the hardware store. If I had done - only offered there things were bulky and especially to the multiple expensive (between 15 and 20 euros). So it ordered from Amazon and wait a few days. The result: simpler, smaller and cheaper as it gets. Due to the extremely low price, I was a bit skeptical, but the thing works and more is needed as well. The only slight addition: after plugging it needs a quarter turn so that the adapter snaps into place and holds. Is for the vast majority probably logical and normal - I as a layman technology needed halt some time before I brought it access roads. Still, I prefer it from any point - though a small Assembly instructions on the package of the manufacturer or dealer should be no problem. Addendum after three months of use: after a few weeks now, the cap that protects the adapter by spring, canceled (rather cheaper plastic). Since I use the adapter to pick up anyway for me just one little problem - nevertheless, I prefer it subsequently a ZIP code.