This neat little gadget is a Spray Diffuser or sometimes known as a blowpipe.
Used to apply Spirit Stains, these are simple to use 'lung powered' atomisers for spraying stains and also thin paints.
The diffuser is opened to 90 degrees and the long end goes into the stain. The mouthpiece is blown through drawing up the stain and spraying it onto the desired item.
It's the product that everyone says 'I've been looking for them for ages'.
Comes supplied in a pack of 2..