
On inspection I've found that this lid has a different valve assembly to
the regular corny keg as it has a backnut. The backnut is plastic, it's split
and apparently it's an odd size. There is now a 17mm hole in the lid
and the only remedy I can think of is to get a nut welded on that will accept
a regular corny release valve.... I just don't know what thread it is?

Model: KEG450
Frothy