As a apprentice pipefitter I used those quite often. (late 60s early 70s) The older people I worked with called it a runner. It was used to pour lead into some hard to work at positions. Used mostly on cast iron soil pipe either above or below ground.
The shop I first worked for was called a Jobber shop. In plain English we did mostly small jobs in houses and very little big commercial type work!
Edit! I hated doing the small work and was much happier when I went to another shop and did large commercial jobs. (chemical plants, other large factories prisons, hospitals, fossil fuel & atomic power plants.) That was where the money was!