I ordered it, but after some time when car was just sitting (winter time), car would not start at spring.
Reason was this part. It was totally oxidized. This part should be coated with something. Or just use only in very warm climate where temperatures does not go below 0.
Simple yet effective gadget to have on cars that you do not use daily and cars that have no problem when battery is disconnected because they are not regularly used. Much better then wrenching the terminal connector every time to disconnect the battery. No tools are required to disconnect the battery after installing this gadget the first time. Highly recommended. Im using this on my Alfa 156 1998 1.8TS