tundish

noun3

1. •
   A kind of funnel used in brewing fitting into the bung-hole of a tun or cask.

   • For filling a bottle with a Tunne-dish. — 1623
2. •
   A funnel used in smelting, foundry work etc.
3. •
   A funnel used to create a siphonic break in a drainage system and/or provide visual indication of flow, usually in an overflow line.