A while back I made a post about a "tray gag" I'd spotted on a picture of
Bridgett Harrington. Curiosity has overwhelmed me enough now that I emailed Bridgett about the source, and it's from Scott Paul Presents. As you can see on the site (it's under The Humiliator) it's part of a range of gag attachments: brushes, trays, coat hooks, insertables. Neat, but expensive though.