I'm not referring to the DS40, which I did not know, but to a seperately sold, original Weller accessory to the Weller mains powered, Magnastat-type controlled soldering irons. I have not recorded the article desigation, but I can ask someone. A similar accessory was once available for the TCP-type lov voltage soldering irons, which I did not mention, because stationary desoldering is better done with a real desoldering station, as others have already stated.