As stated in a earlier post I inherited a old outboard shop, I got with it a bunch of old school tools & test equipment, I was told may not be a good idea to post photos & asked what it was used for as it might "appear" I am trying to learn how to use these tools to run a business. (NOT) so I thought if I know what it is most likely used for and I see a post where info was requested on a subject, I would post what I think may (or may-not) help or be of interest . So this appears to be a flusher (looks homemade) for the older style flush only in a trash-can motors, I tried it on a couple of the older type motors, it works very well, comes with different size tubes & can be built from plumbing scrap or hardware store. I used a regular bungi cord to secure it.