I am guessing that is the 23 plug, kinda hard to find (some on e/pay right now strangely enough) which fits the more popular of machines Bk460 - Bk470, but when you buy them usually that adapter is not included...Personally Jennifer uses a Beltron 8080a, a beast of a machine but really hard to find, and has virtually no support in parts, or plugs, and had to learn it the hard way after modding it with a Bk cable...The difference if anyone cares, is Bk uses volts to clean,and has a relativey low learning curve, Where Beltron uses amps, And is ugly to learn, Needless to say carfull man in the wrong hands, easy to fry a tube.