Awful small hole on the ribbed end that looks like it would have a hose or line attached. If that had a hose attached, to the ribbed end, it would take great pressure to push a low volume out of the narrowed end and why have the holes on the side of the smooth end? Or is it only one hole on the smooth end and one on the ribbed end?
I have looked up drain cleaners, but it would seem the size of the holes would be reversed. Looked up enema devices, thought maybe, who knows. Looked up pressure relief valves but why would a pressure relief valve be connected by a ribbed surface to a hose, unless they ribbed it for another purpose? It looks like something old I've seen before though, just can't figure out what, lol.